Magento Open Source 2.4.4 introduces support for PHP 8.1. All project libraries and dependencies have been updated for compatibility with PHP 8.1. Core Composer dependencies and third-party libraries have also been upgraded to the latest versions that are compatible with PHP 8.1. This release also provides support for OpenSearch 1.2.

Magento Open Source 2.4.4 highlights

Magento Open Source 2.4.4 Release Highlights
Security Improvements
- Additional security enhancements for Magento 2.4.4 include:
Platform Improvements
- Additional platform enhancements for Magento Open Source 2.4.4 include:
GraphQL
- Performance Improvements
- Added storefront-related Admin configuration settings
- Core GraphQL library updated
- GraphQL translation issues fixed
- Vendor-Bundled Extensions
- PayPal Payment Improvements
- Other fixed issues with Magento Open Source 2.4.4

For Detailed Information read more at: Magento 2.4.4 Release Notes