Big 4 Investment Banking experiences

Hey all,

Having my first taste of IB upcoming, will intern in a Big4 CF M&A soon. I didn't get that much of an overview of the tasks of the department in my opinion during the interview process, and I am currently wondering what the daily tasks of me/the team will be. New to M&A's but really interested to know a little bit beforehand, I figure you lot can give me the most down-to-earth practical implications of my internship.

Also, if anybody knows this, what will be the difference between my tasks and interns in solely IB banks?

Thanks for your time!