A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%", or the abbreviations "pct.", "pct"; sometimes the abbreviation "pc" is also used.
Example
50 out of 100 people are participating in the race.
50 is fraction of 100 in the above sentence, we can also say that 50 percent (50%) people are participating in the race.