A Web cache stores copies of data locally on a browser in an effort to speed up execution of instructions, data requests and data updating of information. This temporary storage (caching) of documents – such as HTML pages and images – helps reduce bandwidth usage, server load times and usage speeds.
Because data is stored and served from the smaller cache and not from the more cumbersome original storage location, requests and overall system performance is improved.
- Reduces round-trip time by eliminating numerous HTTP requests for the required resources.
- Reduces total payload size of the responses.
- Reduces the bandwidth and hosting costs for your site.
Google takes a snapshot of each page it examines and caches (stores) that version as a back-up. The cached version is what Google uses to judge if a page is a good match for each query. Almost all search result includes a cached link. Clicking on that link takes you to the Google cached version of that Web page instead of the current version of the page.
This is useful if the original page is unavailable because of: