What is a hot site in a disaster recovery plan?

I am wondering about this question, Please tell me guys What is a hot site in a disaster recovery plan?

A hot site is a commercial disaster recovery service that allows a business to continue computer and network operations in the event of a computer or equipment disaster. For example, if an enterprise's data center becomes inoperable, that enterprise can move all data processing operations to a hot site. It is kind of disaster recovery data center service which helps you to protect you from disaster's.