Answer: The word apostle means “one who is sent out.” In the New Testament, there are two primary usages of the word apostle. The first is in specifically referring to the twelve apostles
This specific type of apostle is not present in the church today. The qualifications of this type of apostle were: (1) to have been an witness of the resurrected Christ (1 Corinthians 9:1), (2) to have been explicitly chosen by the Holy Spirit (Acts 9:15), and (3) to have the ability to perform signs and wonders (Acts 2:43; 2 Corinthians 12:12). The role of the twelve apostles, laying the foundation of the church, would also argue for their uniqueness. Two thousand years later, we are not still working on the foundation.
What exactly would be the role of an apostle outside that of the twelve apostles? That is not entirely clear. From the definition of the word, the closest thing today to an apostle, in the general sense, is a missionary. A missionary is a follower of Christ who is sent out with the specific mission of proclaiming the gospel. A missionary is an ambassador of Christ to people who have not heard the good news. However, to prevent confusion, it is likely best to not use the term apostle to refer to any position in the church today. The vast majority of occurrences of the word apostle or apostles in the New Testament refer to the twelve apostles of Jesus Christ.
There are some today who are seeking to restore the position of apostle. This is a dangerous movement. Frequently, those claiming the office of apostle seek authority equal to, or at least rivaling, the authority of the original twelve apostles. There is absolutely no biblical evidence to support such an understanding of the role of apostle today. This would fit with the New Testament’s warning against false apostles (2 Corinthians 11:13).
In a sense, all followers of Jesus Christ are called to be apostles. We are all to be His ambassadors (Matthew 28:18-20; 2 Corinthians 5:18-20). We are all to be “ones who are sent out” (Acts 1:8). We are all to be preachers of the good news (Romans 10:15).
Note – for a discussion on whether Matthias or Paul was the twelfth apostle, please read the following article:Was Matthias or Paul God’s choice to replace Judas as the 12th apostle?
Recommended Resource: Biblical Eldership by Alexander Strauch