The question you might be asking is, what is a boat rod holder? It is a tool attached to the side of the boat and is meant to hold the rod in place and prevent it from falling over board when you attend to other matters on the boat. There are several advantages to be had from having this device. The fishing rod will be held in place so that you can kick back and relax during a long fishing trip, nor do you have to worry about storing the rod away to deal with an unexpected crisis like a change in weather or the high seas. Rod holders also serve as convenient storage space so that you will never have to worry about fishing lines getting tangled up, or other people stepping on the hooks.
There are several different types of boat rod holders to choose from, the most popular amongst them is the clamp-on style rod because it uses the stern rails, a feature prominent in many boats. Different types support the fishing rod at different angles, the flush mount style is able to hold the rod at different angles, varying from 0 to 15 to 30 degrees and can be fitted onto the gunwale. Other types of rods need small changes to the boat, such as the retro fitting flush mount that requires cutting a hole through the gunwale. The style rod holder requires a base unit to be installed in an unobtrusive place on the gunwale. Then there is the bulkhead style, these rods are permanently attached to the rear of the ship. However, if you do not like the idea of making changes to your boat you can always get the adjustable versions of the boat rod holders which can be easily repositioned anywhere in the boat and can be removed at the end of the day.
Refer on Source : http://marineproducts.soup.io/post/430823881/The-Different-Types-Of-Fishing-Rods-Available