I love the HIndi film industry. I have seen many, many Hindi films. It is "Bollywood" which inspired me to learn Hindi. I have seen everyone of Hrithik Roshan's movies except two. I also love to watch Shah Rukh Khan, Shahid Kapoor, Jackie Shroff, Abhishek Bachchan, Kunal Kapoor, Varun Dhawan and Siddharth Malhotra. I like to watch Preity Zinta, Rani Mukerji, Juhi Chawla, Kajol and Ashwariya Rai Bachchan and so many more. I am disabled and unable to work, so these films and learning Hindi are occupying my time.

I think most people don't make difference between Bollywood and the other "-ollywoods", and usually refer to the whole of the Indian cinema industry using the term.
Also, people tend to think that all Indian movies are the same, which is a pity, because Bollywood itself makes so many and diverse movies every year. I used to be a huge fan of it. However, it has its own rules, that can make the movies a little strange for some foreign viewers.

I have haeard of it and seen movies with it.