50/100 = 50%
A value of 50% shows up in everyday situations like a half-off sale, a test score, or a phone battery reading. It usually means something is split evenly between two parts.
To picture it quickly, imagine a pizza cut into two equal halves, with one half shaded or eaten. If a value is close to 50%, you can think of it as about half.
One common point of confusion is mixing up 50% off with paying 50% of the original price. With a 50% discount, you pay half; the discount itself is half.