You see that [his] faith was cooperating with his works, and [his] faith was completed and reached its supreme expression [when he implemented it] by [good] works.
James 2:22 (AMP)
What the Word is describing here is works of faith. Authentic faith will always produce some kind of corresponding action. In other words, when I believe a certain promise in the Word, my believing this promise will cause me to act in a certain way. Works of faith means that our actions are not an attempt to try to get God to do something, but much rather are they the result of us believing that God has already done it. We act out of what we believe is already finished and available.