Why do you put gum syrup in cocktails?

Excuse me, but could you please elaborate on the reason behind adding gum syrup to cocktails? I'm genuinely curious about its purpose and how it enhances the overall flavor or texture of the drink. Is it a traditional ingredient with a specific history, or is it more of a modern addition? And if so, what specific benefits does it provide to the cocktail-making process? I'd love to hear your thoughts on this.