A tenant at-will takes possession with or without a binding lease and neither specifies the duration of the tenancy nor the rent to be paid
A tenant at will is someone who occupies the premises with the landlord’s approval but without a legally binding lease agreement specifying the lease term or the amount of rent to be charged.
Should the landlord wish to evict the tenant, he must do so by legal process. Until then, the tenant will have the right to lawful possession of the premises.