Yes. This protects both your interests and the interests
of your landlord.
If you elect to take a fixed term tenancy when that
agreement expires you cannot be forced to take out another
may elect to go onto a periodic tenancy with the agreement
of both yourself and your landlord.
Under a fixed term tenancy there is security of tenure
(meaning the landlord cannot regain possession of the
property). There is also a certainty about the rent
during the term of the fixed term agreement, as it cannot
be increased, unless the agreement has a clause specifically
stating to the contrary.