Spotting is few drops of blood that occurs when implantation (baby attaches to the uterus) take place . Bleeding is flow of blood the one u experience during periods

Spotting is light bleeding. It happens when you have a few drops of blood on your underwear. Spotting is so light that the blood wouldn't cover a panty liner. Bleeding is when the blood flow is heavier, enough that you need a panty liner or pad to keep the blood from soaking your underwear and clothes.

It's the intensity difference but both are indicative of some problem