Slot Drill v End Mill

what is a slot drill bit used for   Dan what are slot canyons

I have long been of the understanding that a slot drill and an end mill are two different things in so much as, a slot drill can be used to bore a hole into

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christmas big bass bonanza slot review 4 Flute Milling Cutter Can be used on a drilling press  I used this method often in 5 axis work when this type of slot Can this drill bit be used to start the hole,without center drilling first?