A little time spent reading at these forums would answer your question in considerable detail. We are always encouraged by questioners who show some willingness to do a little work, rather than expecting it to be done for them.
First of all welcome to SQAforums. I have put some threads below which I strongly recommend that you read. Also we do not tend to answer interview questions although Joe has kindly put together some information which is available through the thread that Peter mentioned.
Please look around the forum and use the search feature before posting - there may well be an answer to the questions you want to ask, which there were for both of your questions.