As Christians we are ambassadors for Jesus Christ as we manifest Him in our daily lives to everyone with whom we come into contact. Some of the people we run into are not believers and hopefully are drawn to the Lord through interacting with us. Some of them we see on a regular basis like neighbors, colleagues and the people who work in the stores, coffee houses and restaurants we frequent. As we get to know them there's a real sense that Jesus is able to love them through us and that He is able to draw them to Himself.
"Now then, we are ambassadors for Christ, as though God were pleading through us: we implore you on Christ's behalf, be reconciled to God." 2 Corinthians 5:20