Landing Pages are fully optimized web pages that look beautiful on any device. They're used as an extension to a text message which only gives you 140-160 characters for the entire message.
For example, let's say you want to include your menu, or a schedule of events in a text message but you don't have enough characters to fit it all. This is where a landing page comes in. They allow you to extend your text messages providing more information to your customers.
Learn more here by clicking here.