Token

A token is a permanent that is not represented by a regular card with a casting cost. Usually, but not always, tokens are creatures (It is possible to use cards such as Followed Footsteps and Kiki-Jiki, Mirror Breaker to create noncreature tokens).

If a token leaves play and goes to another game zone, it will be there only briefly before ceasing to exist as a state-based effect.

Examples

• Teysa, Orzhov Scion has the ability: "Whenever another black creature you control is put into a graveyard from play, put a 1/1 white Spirit token with flying into play." If you have a black token creature that gets destroyed, it will go to the graveyard, trigger Teysa's ability and put it on the stack, then disappear.
• Momentary Blink reads in part: "Remove target creature you control from the game, then return it to play under its owner's control." If this spell is used on a token creature, it will leave play, but cannot come back into play and so stays removed from the game. It will cease to exist when state-based effects are next checked.

From the ()