What is the mantle in real life?

Could you please explain what 'the mantle' actually signifies in our day-to-day lives? I've been hearing this term frequently in the context of cryptocurrency and finance, but I'm still somewhat perplexed about its real-world application. Is it a metaphor for a certain responsibility or role? Or does it refer to a specific tool or technology? I'm keen to gain a deeper understanding of this concept, and how it might impact the wider world of finance and digital currencies. Could you enlighten me on this matter?