Invitation to treat

Definition
An invitation to treat

"consists of any statement or conduct which is intended to elicit an offer to contract from some other party (e.g. the display of goods for sale in a shop window, in a catalogue, or by some other medium, such as the Internet) is generally not considered an offer to contract. Such displays are normally considered invitations to the public to offer to purchase the goods."

Overview
"An invitation to treat is less than an offer and it is intended to elicit an offer to contract."