# Main Concepts

In this section, we go through the main concept of MeiliSearch.

Important

MeiliSearch is an asynchronous API. It means that when it does not behave like a synchronous API when you are dealing with the request's responses. Read more in the advanced guide.

# Glossary

MeiliSearch uses the following terms inside the documentation. You should become familiar with them before continuing.

  • Index: Like a table in SQL. It's the entity that gathers all the documents of a given structure.
  • Schema: The definition of the index. The schema describes the structure of the document.
  • Document: Object containing the defined attributes with their associated data.