since I had some weird glitches with my Signal texting up a couple years ago, I've just been using my native texting app that comes standard with Samsung Galaxy phone, so I'm curious...

*app, not "up"

When I send people texts, they might be Apple users or any other various phones and texting apps, are any of their texting apps such that it notifies them when a message has been seen or read?

I don't get "seen" or "read" information on my end. Do they?