PL bulbs are pin-based bulbs with either two or four pins. These bulbs need to be installed in the proper light fixture. They come with many bases, so it is important to check the details to see which base they require. They are also compact in size, which allows you to install them in tighter spaces.
A plug and play PL bulb allows you to use the same ballast you were using with the previous bulb. This helps to save energy and money. You can save money in the long run because you will not have to spend money on an electrician. Instead, you can replace the bulbs by yourself without.
The one downside to plug and play is the upfront cost. This tends to be more expensive in the beginning, but it will pay off in the long run.