Sometimes the word of “leader” is used as a synonym of “manager”. Whereas, if we compare them, we can see that they are not same. In fact, Leader and manager have influencing skills on other peoples’ ability, direct to be active, but there are different factors under these effects.
Manager is a legal person. S/he has a legal authority and manages the company. S/he is an authority person of the company and represents the interests of the head of the company.
Leader is an informal part of the group, s/he doesn’t have a legal authority, but leader can provide everything to people in order to do something in the frame of the rules.
Both leader and manager do similar activities: they stimulate and control the group members and set the relationships and actions among partners.