Those values of x , at which the equation equals zero are know as roots or zeros.
for example
2x+3 = 5
Now this is a equation
we solve for the value of x
2x+3 -3 = 5-3
2x= 2
x=1
Now this x=1 , is a zero of the equation
So
These values are also called as zeros, because they are the values at which the equation equals zero.