In this video i will talk about Units in CSS and what is the difference between Px, Em and Rem. There are two types of units in CSS 1. Absolute 2. Relative 1. Absolute a) cm b) mm c) in d) px (1 inch = 96px) e) pt (1 inch = 72pt) f) pc (1 pc = 12pt) 2. Relative a) em - relative to parent element b) rem - relative to root (HTML) element c) vh - 1% of viewport height d) vw - 1% of viewport width e) % - percentage of parent element