[0]https://www.pensionrights.org/publications/statistic/how-man...
N.B. I believe 'pension' ≡ 'defined benefit' is an American English thing, which may the source of the confusion. I, my employer, and my provider refer to my private, defined-contribution plan as a pension.
By contrast, a 401(K) is a defined contribution plan. You put however much money in, maybe get matching, and you can take money out after a certain age based on how much you put in and how much it grew.
Defined benefit used to be a lot more common but it's become less so for a variety of reasons including tax law changes. Today you see them mostly in government jobs like teachers.
That seems to be a lot less common now.
https://www.investopedia.com/ask/answers/100314/whats-differ...