Anybody can help me?

I'm improving my intranet www site about the lab.
I would like to have more info about "META" Tag.
Anybody can tell me where i can find these info?

Thank you in advance.
Fabio Preda

             ITALTEL SpA - A STET and Siemens Company
                Design Methodologies & Tools Labs
 Name   :  Fabio Preda                    Phone  (+39.2) 43887825
 E-mail :  preda@italtel.it               Fax    (+39.2) 43888593
 Address:  Palazzo Quadrifoglio - CLTE (C01)
           Via Reiss Romoli
           20019 Castelletto di Settimo Milanese
           Milano (ITALY)