I wasn't asking if it was worship.. I was just asking what is the purpose or how does one pray to a saint. i genuinely don't know as i have never looked into it or have done it even once. How does it differ from that you would to god
Specific saints are believed to have experienced both suffering, and God, in a specific and significant way. Believers who feel they are experiencing God in a similar way, or who feel they are experiencing human suffering in a similar way as that saint, will often pray to God before an image of that saint because they feel a kinship with the experience of that particular saint.
This doesn't mean they are praying TO THAT SAINT, however.
Also, some people do pray to that particular saint believing that because that saint suffered in a similar way as themselves, and because that saint found favor with God for that suffering, that maybe that saint can aid their prayers into God's ears, so to speak. They believe the saint can 'intercede' on their behalf, with God, regarding their particular suffering.
But even this, I do not think is 'idolatry', as they are only praying to the saint's spirit to intercede on their behalf, with God. The prayer is still intended
for God, not the saint, even if it's being presented to God by the saint's spirit. (It's kind of weird and complicated, I know, but it's not 'idolatry', per se.)
True idolatry happens when the "stand-in", whether it's a statue, a saint, a book, or whatever else, becomes the
embodiment of God (or God's mind/spirit) in the mind the believer.