the meaning of thank you

I just read this article, 'Thank you in Hindi and English mean very different things.' Similarly to most Americans (I imagine?), I was taught that it was important to remind people that you value them, and I guess I just don't know how I'd do this without saying thank you.
"In the Hindi language, in everyday gestures and culture, there is an unspoken understanding of gratitude."I would love to know how this conveyed. Maybe I'm just not feeling very positive about my daily interactions, but my impression is that the default is understood to be no gratitude unless it's made explicit.