What is prayer?
Prayer is simply just talking to God.
I think that many people pray more than they realise, but because we have complicated prayer and turned it into a formal religious endeavour, we step back from prayer.
God just wants us to talk to Him.
Prayer is the communication process between us and the Lord.

Isaiah 65:24 I will answer them before they even call to Me. While they are still talking to Me about their needs, I will go ahead and answer their prayers!

Christianity is a relationship with a living God. This relationship is built on communication. We need to talk to God (Pray) and let Him respond.