Recessed lighting is perfect for task lighting, like a desk, or general lighting, like a living room. Recessed lighting is housed within the ceiling, providing a sleek design perfect for making lighting seem natural. There are 3 major elements to a recessed light: the can, the trim, and the bulb.
The can is a metal housing up inside the ceiling that provides a spot for the wiring to connect and for the bulb housing. It is important to choose a can that will fit into the ceiling space you have, what trim you want, and the bulb you want to use.
The trim is a decorative ring connected to the can to cover between the bulb and the drywall to finish off the fixture. Each can will have a specific list of trims that it will fit. Since the trim is the part that you see, I sometimes suggest people choose the trim first.
The bulb chosen should match the trim for size. You can select any type of bulb but since it is difficult to change bulbs in a recessed light, I suggest LED. LEDs used in recessed light fixtures should be rated for enclosed spaces in order to have long lives.
As long as you make sure all three components are compatible, recessed lights are easy to install and look beautiful. There are even fixtures now that combine all three components in a single ready-made fixture. I love them!