A. Purpose of prayer is attachment – The term Tefila derives from the word Hatofel Keli Cheres: Torah Or p. 79b-81b 

The word Tefila is related to the word Hatofel Keli Cheres, which refers to one who attaches an item to a vessel. It also relates to the word “Niftol Niftalti/I have become bound.” The correlation between the words is that the entire purpose of prayer is for one to attach his soul to G-d to the point that he becomes a single unit with Him. Thus, the purpose of Tefila is for one to arouse feelings of being attached to G-d.