Log line

A log line or logline is a brief (usually one-sentence) summary of a television program, film, or book that states the central conflict of the story, often providing both a synopsis of the story's plot, and an emotional "hook" to stimulate interest. A one-sentence program summary in TV Guide is a log line.

Charlie Brown is finally invited to a Halloween party; Snoopy engages the Red Baron in a dogfight; and Linus waits patiently in the pumpkin patch for the Great Pumpkin.

A talented but irresponsible teenager schemes to steal his college tuition money when his wealthy father refuses to pay for him to study acting at Juilliard.

The logline for Star Trek was "Wagon Train in Space". Wagon Train had been a high-profile TV show, and anyone hearing the logline would immediately know what Star Trek was about.

...
Wikipedia