A definite integral can also be defined as

The Area Under the Curve

The area under the curve is found by finding [a,b]

where [a,b] are points on the x axis

[a,b] are the points on which you want to find the area

This can be denoted by ${\displaystyle a\leq Area\leq b}$

This is denoted by ${\displaystyle \int _{a}^{b}f(x)}$