What’s your “purpose”?

I’ve heard this phrase a lot over the years, and am still hearing it today, people talking about finding their purpose. What does that even mean? How many of you have struggled with this, and how many are just “meh” about it and couldn’t care less? I don’t think I ever heard my folks or any other family members talk about their purpose, and I don’t think I’ve ever heard any of my friends (almost exclusively Gen X) even mention it. Is this just something younger generations have come up with to add to their stress? I’m genuinely perplexed…