What is the main difference between BTC & BTC Cash?

[Techno Dude]

Can anyone tell the difference, that might be of the programming or anything else..

[Astra]

Bitcoin Cash is a fork of the original Bitcoin that split from it in 2017. The reason for its appearance was the disagreement in various groups of his team and miners about the further improvement of Bitcoin.
Some developers insisted on increasing the block size in the first cryptocurrency blockchain. On July 20, 2017, 95% of miners voted in favor of the Improvement Proposal (BIP-91). It proposed to implement the new SegWit2x protocol on August 1, 2017, but without immediately increasing the block size. Some participants felt that the introduction of BIP 91 without increasing the block size would not solve the problem, but would only postpone it, and would act in the best interests of those who see bitcoin as an investment object rather than a payment system.
A group of developers led by ex-Facebook engineer Amaury Sechet announced the abandonment of SegWit2x, retaining the previous blockchain structure, but increasing the block size to 8 MB. On August 1, 2017, a "forced fork" (hard fork) took place, which was named Bitcoin Cash.

[TomPluz]

Bitcoin is the original while Bitcoin Cash is one of its many clones. As things turn out to be, Bitcoin Cash is a popular fork of Bitcoin and is one of the top coin that we have in the market. Now, I can still remember the heated debate on between Bitcoin and Bitcoin Cash years ago...it was a divisive moment at that time. Of course, there will always be one Bitcoin and that is BTC nothing else no matter how some people can claim anything contrary.