Okay, you can perform spells wandlessly so called wandless magic.
But what is interesting to note here is that the wiki article of silencing charm says Harry used this charm unintentionally and wandlessly which failed and resulted in the blow up of Aunt Marge as a side effect.
But at the same time, the wiki article of inflating charm says, Harry used this charm to blow up aunt Marge.
I guess this needs attention!!