A landing page is designed for a single purpose. Landing pages often focus on a single product, service, or objective such as getting leads. Landing pages are often associated with specific marketing campaigns, in which media and traffic driving efforts direct people to a common page, focused around that campaign. This helps ensure you are creating a personalized user experience.
It is quite common for someone to create landing pages for their Paid Search campaigns, like Google AdWords. It’s important to ensure that the content and topic of the ad effectively correlates with the content on the page.