What is Sir syed tow nation theory?

the theory that sir syed Ahmed khan realised that Muslims & Hindu can't live together because of differences between them. Also Muslims were not given equal opportunities like Hindus & they weren't allowed to practice their religion &culture freely.

So it was at that time when sir syed Ahmed khan realised that Muslims need a separate state where they can practice their religion & culture freely & thus two nation theory was formed that demanded dividing of India into two states on the basis of religion & culture.