How is a common denominator and a common multiple different

A common denominator is when the denominators are the Sam a common multiple is when the multiples are the same

The lowest common denominator, or LCD, denotes the smallest number divisible by the denominators of every fraction in a set, whereas a least common multiple, or LCM, is the smallest multiple that two numbers have in common as products. Finding the LCD and LCM requires knowing prime factors of a number.