What are the differences between the terms obscenity, pornography and indecency?

Obscenity, indecency are more related compared to pornography, although there is sexual indecency, indecency could be many other things, sexual indecency is just one part of it, indecency could be bad gestures. For example saying something that insults a person or his/her religion. Obscenity is something like insulting or rude gestures to someone, sexually. It carries the meaning of inspiring disgust. And for pornography it’s a complete different story, pornography is movies, magazines that has nudity, sex or so on. Its made for earning money, more to business. Obscenity and indecency has something in common but not with pornography.