What is sin?

Recently I learned something about archery. I learned that the distance between where your arrow hits and the desired target is called sin; it's referenced to "missing the mark" having heard the terminology and knowing the archery term, makes it apparent that it's a reflection of our lives. No matter how hard we try, we miss the mark! What a gift Our Father gave us, when he sacrificed his only son, for our inequities. Consider someone asking us, to give our children away, for another missing the mark? Doubtful any person could fathom such a thought. Sometimes, surrendering our will and understanding we're not God, is our greatest achievement. Control? When all is done, we have none, nor have we ever had any!