My website is my 24/7 salesman.  I use SEO to get found for search phrases in the search engines.  My site has a call to action, to collect their info, so I can learn about their business needs etc.  The website can be used with paid ads also, they click the button, they land on my site with a call to action. Plus, having a link to your site from all the major social media platforms helps your site SEO too!