What is the 4 position in Dota 2 and what should it do?

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    In the game Dota 2, I encountered difficulty understanding the role of the position 4. I’m not quite clear on what responsibilities this hero has in the team and how they should interact with other players. I feel that my actions in this position are ineffective, and this affects the team’s success. I would like to understand how I can better support my allies and influence the game.