Most humans can see about 1 million colors. Some people can see around 100 million. This 4-minute video by DNews is an interesting look at this condition, which is known as tetrachromacy.
The average human eye contains 3 types of cones that are sensitive to red, green, and blue wavelengths of light. Each type of cone can detect about 100 different shades, leading to about a million (103) different color possibilities.
For people who are tetrachromats, their eye possess a 4th type of cone, which expands their vision by an estimated 100 times to 100 million.
Only an estimated 1% of people possess a 4th type of cone in their eyes, and even among those who have that cone, very few have been found to actually use it — those people are known as “functional” or “true” tetrachromats.
One reason is that even if you can see more colors than most of the human population, you might never realize it as you go about your day to day life, so you may not know there’s anything different about your color vision compared to others.