Drill driver and drill - the same or different

If you’re referring to cordless drills?

Drill/Driver, is generally the currently used term, since most are designed with multiple speed gears, and a variable speed trigger, and a clutch system, sll to help the drill both drill well, and driver screws well.
I’m not sure when the terminology came about, but probably when manufacturers started adding the clutch to help prevent overdriving screws.

There are also Impact Drivers,(note, this is not the same as an “impact drill”).
Impact drivers have an impact hammer/anvil system built into the driver, like a mechanics impact wrench, which drivers screws using a rotary impact, which allows screws to drive better into tough materials, as well as being more affective at loosening tight corroded or stuck fasteners.

Mostly though, a drill driver is a drill with more than one speed range, and a clutch system( sometimes electronic, sometimes mechanical) abd a variable speed trigger.
Some, though not all, also have a hammer drill function( this is not an impact hammer function for turning stubborn fasteners)
The hammer drill function is for drilling into brick and stone, and hammers a drill bit frontward/backward.

There are also impact drivers, which mostly have one speed range, and are designed for driving screws with a rotary hammer acting, similar to an impact hammer.
This design started out in Japan, and usually has a 1/4 quick change chuck bit screwdriver bits.
There adapter three jaw ckucks you can get for these from Dewalt and Makita.

A few drill/drivers also have an impact function of one sort or another as well.
Metabo for instance, has an electronic function on some drills, which drives the drill with an electrical surge technique similar to what an impact driver will do(although not as quick and hard), the Metabo system was built into Some their regular drills, but not all.

Generally, at least in the past, cordless kits would come with a drill/driver, and a separate impact driver, since building the impact function into the drill mostly didn’t work well, and the Metabo system was patented.

Sorry if this is still confusing, I just woke up.