diff --git a/typo3/sysext/context_help/Classes/Controller/ContextHelpAjaxController.php b/typo3/sysext/backend/Classes/Controller/ContextHelpAjaxController.php
similarity index 96%
rename from typo3/sysext/context_help/Classes/Controller/ContextHelpAjaxController.php
rename to typo3/sysext/backend/Classes/Controller/ContextHelpAjaxController.php
index 5accba2af95e18d4af8277d1772d25babc4f7772..8399e0dfae0b5ef5c018910018536d94385557c3 100644
--- a/typo3/sysext/context_help/Classes/Controller/ContextHelpAjaxController.php
+++ b/typo3/sysext/backend/Classes/Controller/ContextHelpAjaxController.php
@@ -1,5 +1,5 @@
 <?php
-namespace TYPO3\CMS\ContextHelp\Controller;
+namespace TYPO3\CMS\Backend\Controller;
 
 /*
  * This file is part of the TYPO3 CMS project.
@@ -57,7 +57,6 @@ class ContextHelpAjaxController
     protected function getContextHelp($table, $field)
     {
         $helpTextArray = BackendUtility::helpTextArray($table, $field);
-        /** @var IconFactory $iconFactory */
         $iconFactory = GeneralUtility::makeInstance(IconFactory::class);
         $moreIcon = $helpTextArray['moreInfo'] ? $iconFactory->getIcon('actions-view-go-forward', Icon::SIZE_SMALL)->render() : '';
         return [
diff --git a/typo3/sysext/backend/Classes/Utility/BackendUtility.php b/typo3/sysext/backend/Classes/Utility/BackendUtility.php
index 82031dcbf76f363cc3aafd068c1ce09aeb233785..e153658dbd197ca074977773591bf9c527ef3a26 100644
--- a/typo3/sysext/backend/Classes/Utility/BackendUtility.php
+++ b/typo3/sysext/backend/Classes/Utility/BackendUtility.php
@@ -2393,10 +2393,6 @@ class BackendUtility
      */
     public static function wrapInHelp($table, $field, $text = '', array $overloadHelpText = [])
     {
-        if (!ExtensionManagementUtility::isLoaded('context_help')) {
-            return $text;
-        }
-
         // Initialize some variables
         $helpText = '';
         $abbrClassAdd = '';
diff --git a/typo3/sysext/backend/Configuration/Backend/AjaxRoutes.php b/typo3/sysext/backend/Configuration/Backend/AjaxRoutes.php
index 2e7a61198a5cee4d696caf11e710c1d2ab064571..b314f2043f25cf24cdda540ea67bea51682e3da5 100644
--- a/typo3/sysext/backend/Configuration/Backend/AjaxRoutes.php
+++ b/typo3/sysext/backend/Configuration/Backend/AjaxRoutes.php
@@ -232,5 +232,11 @@ return [
     'records_localize' => [
         'path' => '/records/localize',
         'target' => Controller\Page\LocalizationController::class . '::localizeRecords'
+    ],
+
+    // context help
+    'context_help' => [
+        'path' => '/context-help',
+        'target' => \TYPO3\CMS\Backend\Controller\ContextHelpAjaxController::class . '::getHelpAction'
     ]
 ];
diff --git a/typo3/sysext/context_help/Configuration/Backend/AjaxRoutes.php b/typo3/sysext/context_help/Configuration/Backend/AjaxRoutes.php
deleted file mode 100644
index bb66e969d6c4a86731197b7b3c812a632ea78d1a..0000000000000000000000000000000000000000
--- a/typo3/sysext/context_help/Configuration/Backend/AjaxRoutes.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-
-/**
- * Definitions for routes provided by EXT:context_help
- */
-return [
-    // Fetch data about the context help
-    'context_help' => [
-        'path' => '/context-help',
-        'target' => \TYPO3\CMS\ContextHelp\Controller\ContextHelpAjaxController::class . '::getHelpAction'
-    ]
-];
diff --git a/typo3/sysext/context_help/Resources/Public/Icons/Extension.png b/typo3/sysext/context_help/Resources/Public/Icons/Extension.png
deleted file mode 100644
index 1b5e5b28143550a766da4c9bfc954c69e646f040..0000000000000000000000000000000000000000
Binary files a/typo3/sysext/context_help/Resources/Public/Icons/Extension.png and /dev/null differ
diff --git a/typo3/sysext/context_help/composer.json b/typo3/sysext/context_help/composer.json
deleted file mode 100644
index 7d094f1ce0b4581efee5c0f91c7f893922bf1c8f..0000000000000000000000000000000000000000
--- a/typo3/sysext/context_help/composer.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-	"name": "typo3/cms-context-help",
-	"type": "typo3-cms-framework",
-	"description": "TYPO3 Core",
-	"homepage": "https://typo3.org",
-	"license": ["GPL-2.0+"],
-
-	"require": {
-		"typo3/cms-core": "*"
-	},
-	"replace": {
-		"context_help": "*"
-	},
-	"extra": {
-		"typo3/cms": {
-			"Package": {
-				"partOfFactoryDefault": true
-			}
-		}
-	},
-	"autoload": {
-		"psr-4": {
-			"TYPO3\\CMS\\ContextHelp\\": "Classes/"
-		}
-	}
-}
diff --git a/typo3/sysext/context_help/ext_emconf.php b/typo3/sysext/context_help/ext_emconf.php
deleted file mode 100644
index 696db7b1982d6c8d900ff63c02014ca876b93efe..0000000000000000000000000000000000000000
--- a/typo3/sysext/context_help/ext_emconf.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-$EM_CONF[$_EXTKEY] = [
-    'title' => 'Context Sensitive Help',
-    'description' => 'Provides context sensitive help to tables, fields and modules in the system languages.',
-    'category' => 'be',
-    'state' => 'stable',
-    'uploadfolder' => 0,
-    'createDirs' => '',
-    'clearCacheOnLoad' => 0,
-    'author' => 'Kasper Skaarhoj',
-    'author_email' => 'kasperYYYY@typo3.com',
-    'author_company' => 'Curby Soft Multimedia',
-    'version' => '9.0.0',
-    'constraints' => [
-        'depends' => [
-            'typo3' => '9.0.0-9.0.99',
-        ],
-        'conflicts' => [],
-        'suggests' => [],
-    ],
-];
diff --git a/typo3/sysext/core/Documentation/Changelog/master/Breaking-81225-MergedEXTcontext_helpToEXTbackend.rst b/typo3/sysext/core/Documentation/Changelog/master/Breaking-81225-MergedEXTcontext_helpToEXTbackend.rst
new file mode 100644
index 0000000000000000000000000000000000000000..d62679abc7db6dd90fd4847bf633a20b9a8bb7e8
--- /dev/null
+++ b/typo3/sysext/core/Documentation/Changelog/master/Breaking-81225-MergedEXTcontext_helpToEXTbackend.rst
@@ -0,0 +1,32 @@
+.. include:: ../../Includes.txt
+
+=========================================================
+Breaking: #81225 - Merged EXT:context_help to EXT:backend
+=========================================================
+
+See :issue:`81225`
+
+Description
+===========
+
+The extension context_help has been merged into the extension backend.
+
+
+Impact
+======
+
+The extension backend can't be deactivated. Therefore any check if context_help is installed will return false.
+
+
+Affected Installations
+======================
+
+Installations with extensions with checks for extension context_help being installed.
+
+
+Migration
+=========
+
+Remove the checks.
+
+.. index:: Backend
diff --git a/typo3/sysext/core/Migrations/Code/ClassAliasMap.php b/typo3/sysext/core/Migrations/Code/ClassAliasMap.php
index d95341e858ab85b0920522cbd27fde9055bef04a..422fa7fc4e8ea0ad0853d58a2a2ee9930c363ff0 100644
--- a/typo3/sysext/core/Migrations/Code/ClassAliasMap.php
+++ b/typo3/sysext/core/Migrations/Code/ClassAliasMap.php
@@ -1,4 +1,5 @@
 <?php
 return [
-    'TYPO3\\CMS\\Lang\\LanguageService' => \TYPO3\CMS\Core\Localization\LanguageService::class
+    'TYPO3\\CMS\\Lang\\LanguageService' => \TYPO3\CMS\Core\Localization\LanguageService::class,
+    'TYPO3\\CMS\\ContextHelp\\Controller\\ContextHelpAjaxController' => \TYPO3\CMS\Backend\Controller\ContextHelpAjaxController::class
 ];
diff --git a/typo3/sysext/core/Migrations/Code/LegacyClassesForIde.php b/typo3/sysext/core/Migrations/Code/LegacyClassesForIde.php
index 2bdcf10068049e6dde8cc37eb047e4d2ea2501a1..869c2019c80c649db06ae33292596853540f33ef 100644
--- a/typo3/sysext/core/Migrations/Code/LegacyClassesForIde.php
+++ b/typo3/sysext/core/Migrations/Code/LegacyClassesForIde.php
@@ -8,3 +8,9 @@ namespace TYPO3\CMS\Lang {
     {
     }
 }
+
+namespace TYPO3\CMS\ContextHelp\Controller {
+    class ContextHelpAjaxController extends \TYPO3\CMS\Backend\Controller\ContextHelpAjaxController
+    {
+    }
+}