Is lying morally wrong?

In my opinion lying isn't morally wrong, but in some situations is. People lie because of many reasons like: they don't want to hurt or disapoint somebody. Lying in these situations isn't something bad, because we do that  to not let down that person. But when we lie to our advantage, or for lie away somebody reputation it's absolutely wrong. Lies can ruin somebody's confidence, or even life. We have to be very carefull when we are lying because we can unconsciosly do somebody big harm. Additionally when we know that the person is lying, we can not belive in something that she say. We have to know that lying isn't a bad thing, but we have to be very cerefull when we are using it.