Life insurance can be categorized as either "whole life insurance" or "term life insurance". Essentially, the difference is that whole life insurance is designed to provide coverage for the duration of policyholder's life while term life insurance provides life for a specified period of the policyholder's life.
Whole life insurance has the advantage of lacking an expiration date, so long as you keep up with your payments. So the name of it is fairly descriptive, it applies for your 'whole life.' (Or until you reach 100 years old.) This type of insurance policy increases in monetary worth over time.
With this kind of insurance you'll be paying an unchanging amount of money over your life, rather than increasing payments as would occur with term life policies. Furthermore, the value on whole life insurance is a guarantee, rather than the gamble that term insurance is. In both sorts of policies, however, you do have to pay the full premium, or your insurance will expire.
Given the steady, predictable payments and payout, whole life is an excellent option for most people thinking about the long term future. Besides being more or less permanent, it also enables you to build up cash value free of taxation. If you decide you don't like your policy after all, there's no worries. You can cancel it at any time, and get the value of the insurance in cash.
If you're lucky, some whole life policies can even result in more money value than the amount promised. This is a result of changes in the market and rates of interest credit. For instance, these policies can change in value depending on the performance of the policy's company. The difference between whole life and variable life policies is the lack of a guarantee of value. You can borrow against the value of your whole life policy, temporarily 'cashing it in,' as a loan. The value of whole life policies ideally compete fairly with other similar investments in fixed revenue.
Whole-life insurance policies offer more security than term policies, due to fixed premiums and a guaranteed value. There is also the ability for you to earn dividends, added to your policy based on your insurance company's market performance and profits. Whole-life policy interest rates are usually adjusted annually as opposed to monthly (as with term policies) and there are many policy options offered, allowing you to choose one that bests suits your needs.
You should not purchase whole life insurance if you cannot afford it or if there is a good chance that you may not be able to afford it in the future. It's best, however, to purchase life insurance while you are still young. If term life insurance is all that you are able to afford, that's better than no policy at all. The higher premiums found on whole life insurance are because they do cover you for the whole of your life; making it worth the higher costs if you are able to afford it. But whatever policy you choose, be sure that you can indeed afford it. Whole-life premiums will never change, and while this is good if you can afford it in the first place, if you cannot it can be very bad. Get life insurance, but get what you can afford. Any coverage is better than none at all.