When fishing actively, you do not need rod rests, but when static fishing, it can sometimes take hours before you get a bite and it is not ideal to hold the rod in your hand while waiting. Especially if you are fishing with several rods at once, this is simply not an option. Therefore, there is a wide range of different rod rests available. Each support has its own application and is ideally suited for a particular fishery or technique.
A rod rest is indispensable in many disciplines. For example, when fishing with a rod pod https://fishdeal.co.uk/t/rod-pods/ for carp or fishing with a feeder for whitefish. In these techniques it is important that the bait and lead weight lie still on the bottom. There is a big chance that you could move the rig if you were holding the rod in your hand. A support can prevent this in a simple way. By using rear supports the rod is secured and is not easily pulled out of the supports. In carp fishing, snag ears are also used to prevent this.
When fishing from a boat, special rod rests are required. A rod rest is a real godsend, because it prevents you from having to constantly hold the rods in your hand. Rod rests can be used for predator fishing, for example when trolling for pike, but also for carp fishing, coarse fishing and sea fishing from a boat. There are fixed jacks that you actually attach to your boat with screws, but there are also jacks that are attached with a clamp. In this way you will not damage the boat and you can also use the support when you rent a boat.