Porn (noun)

1. Material, such as movies, photographs, or literature, that is intended to arouse sexual desire.
2. Images or videos depicting sexual activity, especially ones that are considered to be offensive or demeaning.

Origin:

From french pornographie, from greek pórnē meaning "prostitute" and -graphia meaning "writing, description", first used in english in 1857.

Examples:

1. He was caught viewing porn on his work computer.
2. She was uncomfortable with the amount of porn he had on his phone.
3. The porn industry is a multibillion-dollar business.
4. The porn movie was rated X and it was not suitable for children.
5. The porn website was blocked by the government as it was deemed inappropriate.