Synced patterns are replacing Reusable blocks, offering a unified creation experience for new pattern functionality coming to WordPress 6.3. Patterns, first introduced in WordPress 5.5, are a collection of blocks that make it simple to add complex layouts and designs to any WordPress site without starting from scratch. With WordPress 6.3, set to be released on August 8th, you will be able to arrange blocks in unlimited ways and save them as patterns for use throughout your site, directly within the editing experience.