Share knowledge for "Selenium"

Rails
1

Now i move towards Selenium Framework.
1.can any one give me some introduction to selenium framework ?
2.why this Framework is used mostly for high level testing ?
3. is this framework is advance than Cucumber ? because cucumber is also
a
high a level testing framework.
4.give me some start up basis tutorial and links .

Regards
Fahim Babar Patel

2

There is this awesome website that you can use to get answers to these
questions, and a whole lot more! See this link for all sorts of
resources
on selenium, cucumber and their differences. LMGTFY - Let Me Google That For You