What is radical function Please make it more popular

What is radical function Please make it more popular

An expression is a radical function, which is called a radical function. To put it more clearly, the function containing the independent variable x under the root sign in the expression
For example, y = √ (1-x ^ 2),
Another example is y = √ x + 1
If y = x ^ 2 / 3 is a power function,
However, y = x ^ 2 / 3 = (3) √ (x ^ 2) (read as the square of X under the triple root)
It can also be seen as root function