Real means genuine or actually existing, while reel is a spool, a lively dance, a short video, or a verb meaning to stagger or wind in. Memory hook: reel has a double e, like the two round sides of a spool.
The core difference
Real describes something genuine or true, while reel names a spool, dance or short video, or means to stagger or wind in.
- real — genuine, actually existing: Is that a real diamond?
- reel — a spool, a dance, a short video, or to stagger or wind in: She reeled in the fish after a long fight.
- reel (dizzy or shocked) — Her head reeled from all the numbers being thrown at her.
How to tell them apart
Real is an adjective, so it describes a noun: real events, a real friend, real wages. Reel is mostly a noun or a verb: a fishing reel, a reel of film, or to reel backwards in shock.
The mix-up shows up when writing about short videos or film, where people write "real" by habit. If you mean the video, the film spool or the dance, it is reel. If you mean genuine, it is real. A quick test is to swap in "genuine": if it still makes sense, you want real.