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This is important for corporations to gain the trust of their customers which increases the profits of companies.
This is important way for corporations to gain the trust of their customers
,which increases the profits of companies.
1) Should I include comma? I think so because it is non-defining clause. If it is not please inform me what is this called?
2) Is it wrong or unclear, if I do not include "way"?
Yes, you do need that comma before "which." Your second question is a little harder to answer without some context, but assuming "this" refers to a way for "corporates" (maybe "corporations" or "companies"?) to gain the trust of their customers, then you should include "way" – but you also need "an" before "important."
Since "corporate" is an adjective and "company" is a noun, I'd also recommend switching "corporates" to "companies" and "the profits of companies" to "corporate profits."
