What is the purpose of using rosin during soldering?

Rosin is used during soldering primarily as a flux to facilitate the flow of solder. It helps to remove oxide layers and contaminants from the surfaces being joined, ensuring a good electrical connection. Additionally, rosin prevents oxidation during the soldering process, which can improve the quality and reliability of the solder joint. Overall, it enhances the effectiveness of the soldering process by promoting better adhesion and creating stronger connections.