Explain what a conformation is and what types of conformations are there

Explain what a conformation is and what types of conformations are there?
CH 3M17120MHHCH3CH 3AntiCHGauche1 760HMinM4 .` CH 3120CH 3C/ }CK ,Partially eclipsedFully eclipsedREDMT NOTE 5 PROMI DUAL CAMERA