The main difference between Jehovah's witnesses and Christians is that Christians believe in the Holy Trinity, which means Jesus (the son), the spirit, and God (the father). Jehovah's witnesses, on the other hand, see the Holy Trinity as something that holds people from recognizing the one true God, which is Jehovah.
They also believe that the world is ending. They do not believe in hell, and they also think that their people serve God on earth and that those who fulfill God's purpose are rewarded and they remain on earth, but if they do not, they die. They also believe that a small group of people end up in heaven. Christians believe that when you die, you go to heaven or hell.
Jehovah’s Witnesses are part of Christianity. It is a branch of Christianity, but it is considered to be nontrinitarian and millenarian and restorationist. Therefore, Christianity is the larger category with Jehovah’s Witnesses is a branch within the category. There are about eight million followers of Jehovah’s Witnesses. Many of Jehovah’s Witnesses go from door to door to discuss their religion with others.
Not all of the branches of Christianity do that. Many of them are less likely to do that. Instead of calling God, they call him Jehovah. That is different from other branches of Christianity that call the supreme being God and not Jehovah. Also, instead of holding the worship services in a church, they call their building a Kingdom Hall.