What is the origin of the idiom "tug at one's heartstrings" and when to use it?

The idiom "tug at one's heartstrings" comes from the idea that our emotions are like strings attached to our hearts. When something deeply moving or touching happens, it feels as if those emotional strings are being gently pulled or tugged, causing us to feel strong emotions. This phrase is used to describe moments that stir our feelings or make us emotional. It is commonly used when discussing moving or touching moments in literature, film, music, or real-life events.