In order to explain the concept of semantic conformity, let's go through a case study using a hypothetical website that sells shoes - www.isellshoeshere.com
Incoming website - www.fashionshoes.net
Incoming link code - <a href="http://www.isellshoeshere.com">Best shoe store in town</a>
Landing page URL - www.isellshoeshere.com
Landing page Title - "I Sell Shoes Here - Baragains on Men's shoes, women's shoes and kid's shoes" (I've stuffed it with keywords a bit but it's for the example ;op )
Landing page description - "I sell shoes here! Shop for the latest styles of women’s shoes, men’s shoes and kids shoes. Find the best deals on sandals, boots and slippers. Free shipping & returns."
Landing page content is OK, well coded with good emphasis on the important keywords "shoe", "shoes" and a good keyword density.
Website linking to the page - relevant websites to the shoe industry.
OK now think about GoogleBot. It's coming to your website from another one which is related to shoe business. The incoming link anchor has the keyword "shoe" in it. GoogleBot will find this keyword several times in the title, description, page body with some emphasis. Finally, there are one or 2 links that also go to shoe-related websites ... Basically you can find the important keyword at every step of the website crawl, from start to finish.
At the end this is called relevancy.