What is th difference between mattcha and Sencha powdered green tea?

I read recently about how healthy Mattcha is, but it is very costly. I bought 30g for $25CND,Sencha was 50g for $8. Anyways what is the difference between the two and what can they be used for?What is th difference between mattcha and Sencha powdered green tea?
The difference is what grade of leaf that you use to create the tea. Bancha uses the largest leaves and so has a less-refined flavor. Sencha is crafted from the smaller leaves, which have a more refined taste. Gyokuro is sencha grown in the shade and thus the most subtle in flavor (reflected in the prices it commands). Matcha is powdered gyokuro whisked into water. It is what is used in the Japanese tea ceremony.What is th difference between mattcha and Sencha powdered green tea?
Matcha is made of tea leaves grown in the shade, and laid out flat to dry (if the leaves are rolled as usual, the result would be gyokuro). These dried leaves are called tencha, and become matcha only when ground. Other powdered teas do not qualify as matcha, but as konacha.