What is SEO and how does it increase website traffic?

SEO stands for Search Engine Optimization. Look at it this way, when you go to Google what do you type?
Say you want to find information on Tacos in Chicago. When you go to Google, you often enter Tacos or Chicago Tacos and results will show up with restaurants in the area that serve tacos. The idea of #SEO is to optimize your website to show up within the search results for your specific area of interest. A website for a company offering Content Marketing should include information on content marketing and services offered. With accurate, up-to-date information on content marketing, Google will be more prone to including your company in the search results. The more you are known as a thought leader in your industry, which means offering proper information on your specific area, the better your chances are of showing up higher in the search
results. Your ultimate goal is to be the top result, but
that can often take years to master. Regardless,
providing the right information on your website for
your specific interest is essential in showing up in
search results or for SEO reasons.
Make sure you cover all areas of your company and
even share information through a blog, which is an
extension of your website that helps to create new
content regularly. By remaining up-to-date with
frequent updates and accurate information, Google is
more likely to find your site when searching for that
information. But remember, don't duplicate content
because that will push you to the bottom of the list.
Google LOVES unique, up-to-date content.

Source