Who is trunks from Dragon Ball Z

Trunks is vegeta and bulmas son in dbz he came from the future to warn goku about the androids and his heart disease then he goes back to the future and in dragon ball gt he is born and he is friends/rival with goten son of goku and bulma. Trunks is a teenager in Dragon Ball GT. He is born in DBZ. The rest of the above is correct except Goten is the son of Goku and Chi Chi, not goku and bulma...