When talking about caching, nearly all the attention goes to ensuring that content is properly stored in the cache. While that makes total sense from a performance perspective, people tend to forget that removing objects from the cache is equally as important.

In this week's 2-Minute Tech Tuesday we'll be talking about "purging", which is Varnish's built-in mechanism to remove non-expired objects from the cache.

So, you've started using Varnish (and you're loving it) and that constant hammering about having a cache invalidation strategy got through to you: you finally decided to write the VCL to purge objects from your beautiful cache. That's good!