What is a Saint?

Do Saints have to be cannonised and beatified by the Church? Are Saints definitely in heaven? The bible talks about sanctified people on Earth who are already Saints, is it still the case today?
lets explore what the meaning of a 'Saint' actually is!!

[@davidbonny8229]

I have always thought that when Paul writes to the saints, he is writing to all born again believers. It is not a badge of honour but a reflection of the position we are in Christ.

[@danmillar9582]

Yes that's right but he doesn't say specifically who are the saints and who aren't but I would guess the sanctified members of his church who have been born again. This means he may of been uncomfortable telling people directly they are saints, instead keeping them assured there is a chance they are saints if they seek holiness.
Old testament Saints are always the dead. Paul definitely showed nuance to the word.