A lease or tenancy is occasionally described as a licence, which is not quite the same thing legally.
In technical terms, a lease or tenancy gives an interest in the premises whereas a licence is only contractual. What on earth does that mean in plain terms?
Basically, a licence gives the tenant much less security of tenure than a lease or tenancy. But a licence is very difficult to legally create validly. So lots of arrangements that are called licences are actually legally tenancies.