There is no easiest way to explain Bitcoin to any person other than telling the truth and the importance of Bitcoin. They'll never appreciate the value and role of Bitcoin to them if they won't clearly understand it that is why we shouldn't hurry to teach them but rather do it step by step until we reach the goal. Because Bitcoin is not just a few words or a simple discussion but indeed, it was a long discussion which means that it takes time for the listeners to catch up. especially when we are mentioning some technical terms.
There is always an easier way to explain Bitcoin but the problem is the understanding of the target person. The easiest way is to say that Bitcoin is like money, it can be transferred, can be bought, can be gift, and can be used to buy merchandise. Anything that is beyond introducing Bitcoin as money will complicate things. So if anyone wants to explain Bitcoin in a simple term, just tell them Bitcoin function like currency that is why it is called cryptocurrency.
If just explaining bitcoin like fiat money proves it to be unremarkable then they won't be interested in bitcoin, there's no easy way to explain bitcoin to people. Bitcoin is essentially virtual with no physical form and you only briefly explain it, which makes it all the more suspicious. The best way is to give them basic material about bitcoin and ask them to spend time learning about bitcoin. Only then will they see the awesomeness of bitcoin and will decide to participate or not?