What is the difference between REM and em and px?

This video tutorial discusses the benefits of using REM over PX for font sizes when designing your WordPress website in Oxygen

Common REM to PX Conversions ; , 30px ; 2rem, 32px ; , 36px ; , 38px

pxj777 REM to PX Converter ; , , 46px, %, ; , , 47px, %,

pxslot This calculator converts pixels to the CSS unit REM The conversion is based on the default font-size of 16 pixel, but can be changed With the CSS rem unit you