MRI techniques are often classified into Spin and Gradient echo sequences. This talk will introduce the basic concepts and elements of both sequences, highlight differences in terms of contrast, such as the T2 signal decay in Spin echo sequences and the T2* signal decay in Gradient echo sequences. It will introduce and motivate the concepts of gradient and RF spoiling, balanced sequences and magnetization preparation and finish with a short outlook on accelerating spin and gradient echo sequences using echo trains.