This document discusses subliminal messaging and advertising. It explains that subliminal messages are hidden messages that influence people's subconscious minds without their conscious awareness. The document notes that while subliminal advertising was common in the mid-20th century, it was banned in the 1970s because people were concerned it could wrongly influence their brains. Subliminal messages can be delivered through various senses like sight, sound, and smell to subtly influence consumer behavior and opinions.