As they are a student only letting agent, all contracts are fixed term ASTs. Put simply, this is an agreement between a tenant and a landlord for living in a rented property. The agreement exists to protect both the tenant and the landlord, as it arranges for a tenant to live in the property for a fixed length of time, after which time the landlord can either claim back possession of their property, renew the tenancy, or allow it to become a periodic tenancy.