Can Vega be negative?

Could you elaborate on the concept of Vega in the context of cryptocurrency and finance? Specifically, I'm curious to understand if Vega, which measures the sensitivity of a portfolio's value to changes in volatility, can ever be negative. I've heard that Vega typically represents a positive value, but are there scenarios where it could potentially be negative? If so, what would that signify for investors and portfolio managers? I'm interested in gaining a deeper understanding of how Vega impacts risk management strategies.