A more thorough explanation:

JAILER

A jailer is a person who is responsible for keeping prisoners in a jail or prison. They are also known as a keeper, guard, or warden.

• The jailer locked the cell door after the prisoner was put inside.
• The jailer monitored the prisoners to make sure they didn't escape.
• The gaoler was responsible for the safety and security of the inmates.

These examples illustrate how a jailer is responsible for the custody and control of prisoners. They ensure that the prisoners are kept securely and do not pose a threat to themselves or others. The term "gaoler" is also used in British English to refer to a jailer.