Are yoga blocks useful? What is it used for?

https://www.wavaryoga.com/yoga-props.html

Yoga bricks are an auxiliary tool for yoga training, helping to adjust postures and assist the body in achieving some movements.

Yoga bricks can help us support different parts of the body and prevent beginners from straining other parts of the body due to poor flexibility or insufficient muscle strength.

When doing some basic yoga movements, such as when the hands cannot reach the ground when doing forward bends, or when the balance is not stable enough when doing half-moon poses, you can use bricks to transition.

Yoga bricks can also help beginners stretch their pelvis, allowing you to slowly adjust the position of the yoga bricks and the ground, and gradually complete a series of training actions such as softness and extension.