Putting in screws.

driver is primarily for screws, but now these days their both interchangeable.

A driver has a clutch on it. You set that to a torque level so that when the screw gets into place the driver will start to slip and not try to drive it in any further. A drill just keeps turning and would be useless for stopping when needed (unless you are quick to shut it off when it reaches the bottom).

Drill-to make a hole Driver-fill a hole

A drill only has one speed to just drill holes in things but a driver has an adjustable clutch intended for driving screws so as not to strip them out when they begin to tighten.

A driver would be used for screws… generally for doing something such as woodwork. The two are generally interchangeable as they have the same type chuck system. Some of the possible differences are as follow. The drill likely has a heavier duty motor to handle the increased heat from longer run times and possibly a larger chuck to accept larger drill bits. The driver likely has an adjustable torque setting to keep you from over torquing screws and breaking stuff by accident.

I’m not sure which one your looking at…but generally speaking…a driver is used for screwing things…so to speak. It probably comes with “screw driver” bits vs drill bits. It may also have bits for screwing in bolts - kind of like a socket wrench without the ratchet…Phillips head screws are the most common- drywall screws. Screws have replaced the “old fashion” nail for many applications, like installing decking for example. Having said that, there are bits out there that might work…in a driver…
If it came down to which one to buy - a drill OR a driver/scew gun. Buy the drill. It can be used as both(for sure). A screw gun is for screwing only. You will want a varible speed option especially if you are new to power tools. Drywall “guns” for example are one speed only and take some getting used to. Some drills don’t have a reverse option - hammer drills for example, sometimes don’t . They are kinda like a jack-hammer and drill all in one and are used for drilling through concrete, rock, etc. The reverse feature is a must for backing out or reversing screw/bolts(duh).
As a homeowner, your probably fine with the Sears brand or even a Black& Decker. The pros will buy a better/ more expensive brand. The higher the volts the better…mo power!
Cheers