ANTI ALIASING IS A TRICK TO FAKE HIGHER RESOLUTION

SSAA(Super Sampling Anti-Aliasing) :

(It is old not using now a days because it uses so much processing power).

MSAA(Multi Sample Anti-Aliasing) :

(It only smooths out the edges of polygons, not anything else).

CSSA(Coverage Sampling Anti-Aliasing) :

(These are used by newer NVIDIA and AMD cards it is similar to MSAA).

FXAA(Fast Approximate Anti-Aliasing) :

(It has a very small performance cost and better than CSSA and MSAA It is not recommended for crisp images).

TXAA(Temporal Anti-Aliasing) :

(It only works on certain newer graphics cards, but It's better than FXAA).