The texture of canned “black olives” isn’t really all that different from most types, but they have a much weaker flavor because they are processed in a matter of days instead of weeks/months/years of the alternative methods. Those longer methods, usually some combinations of brine and/or fermenting are where most of that flavor comes from. I only know this because I had a grand idea to try to grow my own olives and I looked into it and realized I wasn’t ever going to end up with my own that resembled stuff from the store. This is just more random info hiding in my brain instead of things that would be useful on a daily basis.