Schema
SEO is essential because of the huge volume of data on the web, and your content must be found by search engines easily. Using structured data makes this easier; this is done by marking up content with extra info embedded in the code. It gives the search engine more details, helping them to understand the content better.
Schema.org is a website where the tag vocabulary is available to mark up structured data. A hierarchy of types can be seen like Review, CreativeWork, Product, Event, Person, Organization, Place etc. Creativework is generic and can have more sub-types, like recipe or movie etc. A list of properties can be seen within each type, used to describe this type further. E.g., the type Recipe will have properties like Ingredients, cookTime, recipeInstructions, etc. By combining these types and properties in your website code, you can define sections of content for search engines in a better way.
When search engines get additional info from schema markup and understand your content better, it can boost your search visibility. Your content can even get displayed as rich snippets or rich results which grab user attention and improve click-through rate and boost rankings in searches.
Specific content types deliver more benefits from schema markup than others. Specialized page content has the best possibility of giving improved search results, so schema markup must be performed for such content.