The ligature is the part of the saxophone that fixes the reed to the mouthpiece. All mouthpieces usually come with a standard metal ligature which is very basic and offers little or no enhancement to tone production. It is vitally important that the reed is fixed as flat and securely as possible on the mouthpiece table. The sound can be improved significantly with a good quality ligature without having to break the bank.
A good ligature can also prolong the life of your reeds, as the reed remains flexible and has room to breathe.