What is buy side / sell side?

What is buy side or sell side? I have been coming across these terms but I am unable to distinguish.

Buy side - are these the clients or the portfolio managers who simply are interested in buying the securities, etc.

Does this side also have research analysts - like buy side analyst who write reports on companies / etc. specifying whether to buy a stock or not. Umm… I think I am wrong = who is a buy side analyst?

Sell side - those who make efforts and arrangements for sale such as Investment banks? Sell-side analyst who writes reports on companies - good report - good stock - trade in this stock… buy or sell side analyst? But what exactly is a sell side analyst? Is there a buy side analyst? Clients cannot be sell side?

Please simplify…

Buy side: investing the company’s money, hush hush.

Sell side: investing client’s money. Pitching ideas, research reports to direct trades through your bank.

buyside

http://www.cnbc.com/id/101716539

Sell side is where they throw the parties.

Buy side is who gets the invitations.

On the buy side, you get to say FU before hanging up the phone.

Haah!

Buyside = BSD

Sellside = Big Swinging Sock