The abs() and fabs() functions are both used to compute the absolute value of a number, but they are implemented differently in different programming languages.

1. abs() function:
   • abs() is a built-in function in many programming languages, including Python.
   • It is used to compute the absolute value of an integer or a floating-point number.
   • In Python, the abs() function can be used with any numeric type (int, float, etc.) and returns a positive value.
   • Example usage in Python: abs(-5) returns 5, abs(3.14) returns 3.14.
2. fabs() function:
   • fabs() is a function defined in the C programming language’s standard library.
   • It is used specifically for computing the absolute value of a floating-point number.
   • fabs() is part of the math.h header file in C.
   • Unlike abs(), fabs() is designed to work with floating-point numbers only and returns a floating-point value.
   • Example usage in C: fabs(-3.14) returns 3.14.

In summary, abs() is a more generic function that works with both integers and floating-point numbers, whereas fabs() is specifically designed for computing the absolute value of floating-point numbers. The choice between abs() and fabs() depends on the programming language and the type of numbers you are working with.