It's about relationship. One of the most powerful reasons to pray is to maintain a strong relationship with God. Prayer is conversation with Someone we love and with whom we want to stay close. It is communication with our heavenly Father. When we pray, we are enriched by the growing bond that develops between us and the Lord.
Prayer is complex.
That's all the motivation we need to make every day a day of prayer. Therefore we need to pray. Praying is talking to our best friend.