Caching

Caching speeds up your website by storing commonly used or resource-intensive objects in a server-side cache. The server-side cache keeps these objects available rather than reinitializing them each time they are requested. In a scaled-out scenario, you can synchronize the various server-side caches using remote synchronization.

RWS Community Article: What is the Tridion Object Cache?

For an implementer's own view on caching, refer to the RWS Community article at this URL: https://community.sdl.com/product-groups/tridion/tridion-sites/b/techweblog/posts/what-is-the-sdl-tridion-object-cache.