What is the meaning of Cokernel?

The coequalizer of ${\displaystyle f}$ and the zero morphism from ${\displaystyle X}$ to ${\displaystyle Y}$, denoted ${\displaystyle \operatorname {coker} f}$.

1. The target of ${\displaystyle \operatorname {coker} f}$, denoted ${\displaystyle \operatorname {Coker} f}$.

The target of ${\displaystyle \operatorname {coker} f}$, denoted ${\displaystyle \operatorname {Coker} f}$.

Source: wiktionary.org