Blinded (conditions)

* A blinded creature can’t see and it automatically fails ability checks that require sight. * Attack rolls against a blinded creature are made with advantage, and the creature’s attack rolls are made with disadvantage.

Source: 5e Core — official document

* A blinded creature can't see and automatically fails any ability check that requires sight. * Attack rolls against the creature have advantage, and the creature’s attack rolls have disadvantage.

Source: 5e Core — official document

While you have the Blinded condition, you experience the following effects. * Can’t See. You can’t see and automatically fail any ability check that requires sight. * Attacks Affected. Attack rolls against you have Advantage, and your attack rolls have Disadvantage.

Source: 5e Core — official document