What is Cache in Samsung Smartphones?

A Cache in Samsung Smartphones is a place to store something temporarily. The storage place is called as cache memory and the stored data is called as cache data. The files you automatically request by looking at a Web page are stored on your device memory in a cache subdirectory under the directory for your browser (for example, Internet Explorer). When you return to a page you've recently looked at, the browser can get it from the cache rather than the original server, saving your time and the network burden of some additional traffic. 

The cache is basically a temporary storage area for an application while it's running __ it can store things like temporary images downloaded from the internet. Clearing it shouldn't really have much of an effect from a user perspective.