Cookie
A cookie is a piece of information that a web site(web server) puts on your hard disk while surfing a web site through browser so, that it can remember something about the user & user's log in details for future use.
Cache
Copies of web pages stored locally on an Internet user's hard drive or within a search engine's database. When you return to a page you have recently visited, the browser can get it from cache rather than the original server location.
