What kind of programers exist?

Question

Lately I've been searching the Internet to find what kind of programers exist when it comes to job responsibility. For example the web developers, I know that they are responsible for web pages or all the things that are related with internet but i dont know what they exactly do. I've watched a lot of videos but I still cant see the big picture, not just for web developers but also for the others that exist. Can you tell me what are the others and with examples of what their job responsibilitles are?