Landing Pages are a distinct page on your website that’s built for one single conversion objective. It's a page within your website built with a single actionable ask that facilitates the completion of that objective. Usually a landing page is a One page advertisement.
Landing pages are often linked to from social media, email campaigns or search engine marketing campaigns in order to enhance the effectiveness of the advertisements.
The design of the landing page layout matters and this should be tested with different ideas and page layout styles to see what converts and works better