Internal links are links on a page on your site that go to another page on your site. Inbound links are other websites that link to your content. Both are valuable for SEO.
PPC advertising is one of the most important tools in your toolbox. This form of advertising drives results and increases brand awareness to your target audience. While SEO can take a long time to drive you to front page results, PPC can reach your target audience in a matter of days, not months or even years.