I have lived long, and learnt much. I have read many posts on this site. And I know, please the word "know", that most people on this site have no idea of what a spell actually is! Many have cast spells without knowing it.
If you have ever blown out the candles on a cake, and then made a silent wish, you have cast a spell. Ever pulled a wishbone? That's another spell. Catholics will go to church,buy a small candle,light it from the other burning candles, and then say a prayer. They have cast a spell, but are not aware of it!
A spell is a ritual wish. The difference between a spell and a prayer is that a prayer is "asking" for help from a higher power.(Deity). A spell is a do-it-yourself operation.