10 Reasons Christians Should Thank God. What is Thanksgiving? Thanksgiving is the act of showing gratitude to someone for something done. Thanksgiving as the name implies is the act of giving our thanks through appreciation to someone for something received from them. Thanksgiving is the act of expressing our heart of gladness to someone for something done for us or received from them. Thanksgiving is a way of thanking, worshipping and praising God, our heavenly Father what what He has