What is if you will?

It seems like you might be asking about a concept or phrase, but your request is a bit unclear. "If you will" is a phrase often used in conversation to invite the listener to consider or accept a metaphor, analogy, or less formal expression of an idea. It softens the statement, suggesting that what follows is a figure of speech or a slightly unconventional way of explaining something. For example, one might say, "We are launching, if you will, the next generation of smartphones."

If you're referring to something else or need information on a specific topic, please provide more details or clarify your request, and I'd be happy to help!