TL;DR
Browser caching is the storage of HTTP responses on the client so that repeat requests for the same resource can be served locally, controlled by response headers such as Cache-Control, ETag, and Last-Modified.
What is Browser Caching?
Browser caching is the storage of HTTP responses on the client so that repeat requests for the same resource can be served locally, controlled by response headers such as Cache-Control, ETag, and Last-Modified.
Learn more in our improving your cache policy guide, or work with us through our done-for-you speed optimization service.
How Browser Caching is Measured
Cache headers are inspectable in the Network panel of Chrome DevTools, and Lighthouse audits 'Uses efficient cache policy on static assets'.