Golf bags have a club divider system to make it easier to organize your irons and other golf clubs. What's more, they also prevent your golf clubs from colliding with one another and scratching the faces. Most standard golf bags come with four club dividers. However, some bags can have many more.
You can find specialized golf carriers with dedicated dividers for your irons, wedges, putter, woods, and driver. If possible, get your hands on one of these bags, so you don't have to deal with your irons, putter, or driver clicking and dinging together as you're trying to enjoy a relaxing day on the green.
Some people prefer a bag with several club and iron dividers, but a lot of the pros use one with four or fewer. It all boils down to your personal preferences and how you like to arrange your woods, putter, wedges, driver, irons and other golf clubs.