You should research it -- there's "term" and "whole" life insurance, for example. Term you buy for a set number of years and in my opinion, this is the one that makes the most sense because I think most people only need life insurance for a specific number of years and not necessarily their entire lives. For example, when I was a young mother with three kids, I had a term life insurance policy so that if I died, my DH could use the money to hire a nanny to take care of the kids. Now, the kids are all grown and I don't have any life insurance at all because I no longer need any. (I don't need any because (1) I'm donating my body to science when I die and when they are done with it, they will cremate it and return the ashes to my family, who can then scatter them or whatever; (2) I have an annuity that pays out if I die and the monies from it can pay for my final bills and funeral expenses; (3) I have enough money in my savings accounts to cover any other expenses; (4) I own my home, so no mortgage to pay off.)
When I did have a mortgage, I bought a rider to my mortgage that would pay off the house if I died, so my family wouldn't be stuck having to make the house payment. So, you can look at exactly why you want a life insurance policy and research the different ways to attain what you want for a reasonable cost.
-Dorothy (LadyZolt)