Deacons - the Biblical definition

And in those days, when the number of the disciples was multiplied, there arose a murmuring of the Grecians against the Hebrews, because their widows were neglected in the daily ministration. 2Then the twelve called the multitude of the disciples unto them, and said, It is not reason that we should leave the word of God, and serve tables. 3Wherefore, brethren, look ye out among you seven men of honest report, full of the Holy Ghost and wisdom, whom we may appoint over this business. 4But we will give ourselves continually to prayer, and to the ministry of the word.
— Acts 6:1-4 KJV

Simply put, a deacon is a servant of God ministering to others in the Body of Christ.  The early church deacons were the ones who attended to the people's needs in the church so that the ministers would be able to minister and not have to worry about whether everyone had a seat or were greeted or had food.

Without Deacons and the Ministry of Helps, our modern day preachers would be running the praise and worship, greeting at the door, making sure everyone was fed at fellowship meals, changing light bulbs, etc.  We are blessed to have men like these who can take that burden off our Pastors and let them do what God has called them to do - train up the saints and equip them to do God's work.

Our Deacons 

Deacon Dennis
Deacon Dennis
Deacon Jason and his wife Jennifer

Deacon Jason and his wife Jennifer

Deacon Jeff and his wife Ruth

Deacon Jeff and his wife Ruth