Prayer is a very important part of being a Christian. It is a direct link to God and you can talk to Him orally or simply with your mind and in silence. Often, prayer seems to be an abstract entity in that you do not always get an immediate response and it may take years to get an answer.
Understandably, Christians themselves sometimes wonder what is going on.
One of the problems with prayer is that if an answer does come speedily, it is often confused with co-incidence and people doubt its validity. However, if you take the time to analyse worldly situations, it becomes obvious that prayers have been answered in one form or another.
There are many stories of soldiers, sailors, airmen and others in dangerous situations who have prayed to God and been saved. Sceptics would claim it is simply luck but that is an even more obscure entity.
It follows then, that prayer is a valid form of communication with God and does have power in helping others. Prayers for others are the strongest.