Question

i want to understand the topic rational number in brief

Answer 1

Anumber which can be written in p/q form that is like 2/3 or 9/1 and many more
but note that the denominator should not be 0 like if 2/0 is written it is not a rational number.Examples of rational number are 3/8 or 5/3 etc.

Answer 2

a number which can be expressed in the form a/b, b should be a non zero integer.
eg... 5/7,-9/12