Different denominations of the Christian faith baptize differently. We ask that Scripture be your guide as you follow Christ in every decision including Baptism. Being baptized by immersion simply means that you are totally immersed under water (though not for long).
And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him;
And he commanded the chariot to stop, and they both went down into the water, Philip and the eunuch, and he baptized him. And when they came up out of the water, the Spirit of the Lord carried Philip away, and the eunuch saw him no more, and went on his way rejoicing.