There are Team Leaders in almost every industry, from sales and marketing to design and production and, as such, the specific roles and duties differ slightly from company to company but the key aspects remain the same across the board.
Team Leaders provide instruction, guidance and direction to a specific subset of a company’s employees - their team - for the purpose of achieving a target or particular outcome. They monitor and manage progress and results as well as learning every team member’s strengths and motivations in order to best utilise each individual under their supervision.
Usually reporting to a manager, the Team Leader serves as the conduit between management and their team while often also working within the team as a member. They are also responsible for conflict resolution, motivation and establishing collective unity or team spirit within the group.
Source: http://joboutlook.gov.au/