Why does my computer suddenly have BitLocker?

I'm curious, why did my computer suddenly activate BitLocker? Is it a security measure that I wasn't aware of? Did it activate automatically, or was it triggered by something specific? I'm concerned about the implications this might have on my data and privacy. Is there anything I should do to ensure my information is secure? Can you explain the purpose and benefits of BitLocker, and if there are any potential drawbacks I should be aware of?