Colossians is the twelfth book of the New Testament and the seventh book of the epistles.
The first half of the Book of Colossians is a theological treatise that includes one of the most profound presentations of Christology anywhere in the New Testament. The second half is a mini-ethics course, addressing every area of Christian life. Paul progresses from the individual life to the home and family, from work to the way we should treat others. The theme of this book is the Lordship of Jesus Christ and His sufficiency in meeting our needs in every area.
Colossians was written explicitly to defeat the heresy that had arisen in Colosse, which endangered the existence of the church. While we do not know what was told to Paul, this letter is his response.
We can surmise based on Paul’s response that he was dealing with a defective view of Christ (denying His real and true humanity and not accepting His full deity). Paul appears also to dispute the “Jewish” emphasis on circumcision and traditions (Colossians 2:8-11; 3:11). Paul does a remarkable job in pointing us to the sufficiency of Christ.
The Book of Colossians contains doctrinal instruction about the deity of Christ and false philosophies (1:15-2:23), as well as practical exhortations regarding Christian conduct, including friends and speech (3:1-4:18).
(Note: Description used with permission from www.gotquestions.org)