Does mana carry over turns?

Could you please clarify for me if the resource known as "mana" persists across different turns in the game? I'm curious to know if it accumulates or resets at the start of each new turn. Additionally, I'm interested in understanding how the carryover of mana, if any, might affect strategic decision-making within the game. Could you elaborate on this aspect and provide any relevant insights? Thank you for your assistance in clarifying this matter.