What does the Index field actually do?

I couldn’t find an answer to this in the Frappe Framework document.

I assume checking the field will result in data getting indexed in the db.

@Muzzy Indexing a field (or column) in a database table means creating a data structure that improves the speed of data retrieval operations for that field. An index works like a lookup table that allows the database to locate data quickly without scanning every row in the table.

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Thank you. I am aware of what you stated. My question us does the check box leads to db index of the field or it has some other purpose?