What is difference between linear and radial gradient?

Answer 1

a linear gradient is a straight progression and a radial gradient is a circular progression.

Linear Gradient Example:
https://qph.is.quoracdn.net/main-qimg-aca452d76b6e833cccacea8d3294686d?convert_to_webp=true

Radial Gradient Example:
https://qph.is.quoracdn.net/main-qimg-0302968ef25ba643c1a251d264cebee4?convert_to_webp=true

Answer 2

A linear gradient is horizontal, i.e the gradient colors appears as one on top of the other but for the radial, it takes a shape of either an oval or circle.

Answer 3

A linear gradient progress in linear way,whereas radial gradient propagate either in a circle or ecliptic way.