What is Schema Markup Code?

I'm trying to understand what schema markup code is and how it works. From what I've gathered, it's a way to help search engines understand the content on a webpage better, but I'm not entirely sure how it's implemented or what benefits it provides. Can someone explain in detail:

  1. What exactly is schema markup code?
  2. How does it improve SEO and search engine visibility?
  3. What are some common types of schema markup?
  4. How do you add schema markup to a website?
  5. Are there any tools or plugins that can help with implementing schema markup?

I'm looking forward to learning from your experiences and insights on this topic!

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