How would you define "faith"?

Would faith be something you feel in your heart?
Is faith something you know in your mind?
Does faith require logic or thinking?
If people live without faith, what would be the attributing factor?

I ask these questions to know whether faith in religion is required because there are no definitive, authoritative, or rational answers. There are no right and wrong answers and this isn’t a test of faith. I want to see what as many people can answer explain on behalf of their current knowledge and explication.