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Don't worry, we won't hate you. They're complicated products.
Straight vanilla Universal Life can also be called declared-rate universal life, meaning that growth is credited to the policy based on a declared interest rate. Variable UL and Indexed UL are just policies that use a different crediting method.
With an IUL, the interest-crediting rate on premiums changes with the performance of a selected equity index (S&P, NASDAQ, etc.) instead of an interest rate set by the insurer.
VUL policies require a securities license to sell. With a VUL, money (from premiums and CV) is placed into a Separate Account and the policyowner can decide how to divvy it up into various subaccounts. The subaccounts are differentiated by the level of risk and reward they might offer, as well as the type of investment. Some companies have three subaccounts for their VUL products, some have twenty. If it's three, the policyowner usually has the option of bonds, stocks, and money market investments. More than that, you get into subsets of each of these: corporate bonds, high-yield corporate bonds, and government bonds for example.
The policyowner can usually also place money into a Fixed Account (separate from the Separate Account) which has less of an investment-style flavor. Here, the interest rate floor is declared and the principal is guaranteed.
Hey, just to make things more confusing, VUL policies sometimes offer Option A, Option B, and Option C. Option A and B are the same as always, Option C is essentially a DB plus ROP.
I'm rambling. Did you have any specific questions about how it works, or is the basic overview helping?
Great post, Nick. Keep it up.