An SEO audit is a process that will give you a better insight into your website, individual pages, and overall traffic. It is a great way to improve its performance allowing you to rank better in the search engine result pages.
The first thing you need to know is that an SEO audit gives you and accurate measurement on how your website is doing. When done correctly you can help you determine pros and cons of your website, and what can you do to improve its position in search engines. Better position means more visitors and having an edge on your competitors.