RE: What is SEO?

Thanks for this questions.

The elaboration form of SEO is “search engine optimization.” SEO is the process of getting traffic from the SEARCH ENGINE for “free,” “organic,” “editorial” or “natural” search results.

In a word we can say that, Search engine optimization (SEO) is the practice of increasing the quantity and quality of traffic to the website through organic search engine results.

That means a people will search something on the Search Engine (Google, Yahoo, Bing and Top Search Engine List) They will get the results from there.
As for Example,
This websites name is ” Answers Mode and it’s URL or Address is https://www.answersmode.com” If you search on any search engine by typing Answers Mode then you will get this website. You don’t need to remember this websites full address. and it comes for Proper SEO.

What goes into SEO?
For your better understanding what is SEO really, let’s see the points below:

Quality of Traffic
Quantity of Traffic
Organic Search Results

If you want to be a SEO Expert, of course you must learn this topic,

1. How SEO works
2. Building an SEO-friendly website
3. Content and related markup
4. On-page topics
5. Link-related topics
6. Other optimization
7. The evolution of SEO
8. Off-Page optimization

Click here to Get Search Engine Optimization (SEO) Starter Guide from Google.

Watch this video to get more details