A Sells (Landing ) page is a website without the menus that distract your audience from leaving your current page. It tells a story, it funnels your audience all the way to your CTA (Call-To-Action) button for better conversion.
The home page of a website is not the only Sells page and every page on a website has a purpose. A Sells page should contain content that relates to the keyword search phrase.
A website Sells pages can be used for a couple different purposes. It can be used in a "pay per click/marketing" campaigns. It helps with your search engine optimization.
SEO landing pages are designed to show up naturally in organic search engine listings. Sells pages nearly always provide better conversion rates than directing all traffic to the home page. As I mentioned earlier your Sells pages bring people directly to the content they seek through the funnel.