Why a rental contract?

It is signed when a property is made available by a lessor to a tenant. It will include all the commitments and particular and general obligations of the parties during the entire rental period. There are several types of leases.

There is the residential lease, called the "loi de 89", which allows you to rent an unfurnished apartment. The lessor is committed to an irrevocable term of 3 years and can give notice at the end of the term with a 6 month notice period if there is a serious reason such as the property being put up for sale or the desire to take it back. The tenant, on the other hand, can give notice of 1 or 3 months, depending on the geographical area, at any time.
there is the furnished lease. It is subject to obligations on the part of the lessor in terms of furnishings and equipment. It is generally concluded for an irrevocable period of 1 year for the lessor, but can be for a period of 9 months when the tenant is a student. The lessee can leave at any time after giving one month's notice.
there is the professional lease. It is generally concluded with the liberal professions. It is not suitable for a lessee whose activity is commercial, industrial or craft. It commits the lessor for a period of 6 years, with the possibility of giving notice at the end of the term, subject to 6 months' notice but without the obligation to give reasons.
there is the commercial lease. Or called 3/6/9 because of the duration of the parties' commitments. It commits the lessor for an irrevocable period of 9 years with tacit renewal and offers the commercial ownership of the premises to the lessee. The lessee is committed for an irrevocable period of 3 years with a notice period of 6 months in case of dismissal.