Fishing rod holders are the most effective way to tidily store rods on a boat when you're not using them. The other major use for holders is to keep multiple active lines in the water to increase your odds of a bite, or keep a line active while you use your hands for other tasks.
Are fishing rod holders universal?
Some rod holders are designed specifically for fly fishing rods or ice fishing rods, but most are either adjustable or offer universal fit.
What should I look for when buying fishing rod holders?
The most important thing to look for is that the holder will fit your rod and hold it at an angle that's useful for you. Extra features like tension lock bars or adjustable bases can help you fine-tune holders to support your fishing.