An employee relocation agreement is a contract between you and your employer that says, essentially, your employer will cover X% of your moving costs.
These employee relocation agreements arise when your employer asks you to move, such as to a new city. In many cases, your employer will cover these expenses, especially if you work for a large corporation. However, even if you do not, you can often bargain for an agreement to cover at least some of the costs. This is referred to as an employee relocation agreement.
The agreement may contain other terms as well, including what work you agree to do in the new city (an employer isn’t going to want to pay for your to move to San Francisco only to see you quit one day after you move in).
Learn more about employee relocation agreements.