Grappled (conditions)

* A grappled creature’s Speed becomes 0, and it can’t benefit from bonuses to movement speeds. * If the grappler becomes incapacitated the condition ends. * If an effect removes the grappled creature from the reach of the grappler or grappling effect (such as when a creature is shoved away by the Doubleteam combat maneuver) the condition ends.

Source: 5e Core — official document

* A grappled creature’s speed becomes 0, and it can’t benefit from any bonus to its speed. * The condition ends if the grappler is incapacitated (see the condition). * The condition also ends if an effect removes the grappled creature from the reach of the grappler or grappling effect, such as when a creature is hurled away by the *thunder-­wave* spell.

Source: 5e Core — official document

While you have the Grappled condition, you experience the following effects. * Speed 0. Your Speed is 0 and can’t increase. * Attacks Affected. You have Disadvantage on attack rolls against any target other than the grappler. * Movable. The grappler can drag or carry you when it moves, but every foot of movement costs it 1 extra foot unless you are Tiny or two or more sizes smaller than it.

Source: 5e Core — official document