To make your browsing experience more efficient, web browsers cache data, which means they store files on your computer. They do this so when you return to a website, you don’t need to download all if its elements. For example, if you regularly view a web page that contains a number of graphics, not downloading those graphics will save time, and save bandwidth, both for you and for the web host.
Sometimes, however, you may want or need to delete that cache. This is a first-line troubleshooting technique when you are having difficulty displaying web pages. Different browsers have different methods for doing this, and Apple’s Safari makes this complicated, for some reason. Here’s how you can delete your Safari browser cache.
Read the rest of the article on The Mac Security Blog.