Evangelism

Matthew 28:19-20 New Living Translation (NLT)

Therefore, go and make disciples of all the nations,[a] baptizing them in the name of the Father and the Son and the Holy Spirit. 20 Teach these new disciples to obey all the commands I have given you. And be sure of this: I am with you always, even to the end of the age.”

"Evangelism" simply means "to tell" or "to announce good news" or the Gospel of Jesus Christ.

Acts 1:8 (NLT)

But you will receive power when the Holy Spirit comes upon you. And you will be my witnesses, telling people about me everywhere—in Jerusalem, throughout Judea, in Samaria, and to the ends of the earth.”

To be a witness is to be ready to give Testimony (an open declaration or confession) of what you have seen and heard. We are to live a life that attests to that confession. To be a witness is to let our light shine through the good works that we do and share the gospel message when the door of opportunity is open.