Reindexing programmatically in Magento 2 means updating the database as per the changes made in the backend by the admin.
The Magento 2 database is complex enough to reflect the changes made by the admin in the backend immediately on the frontend. Therefore, the admin may require to reindex the database to ensure that all the information is up to date.
Magento 2 store admin can reindex the database from the backend admin panel. However, developers can also use an alternate way to reindex Magento 2 programmatically. In order to perform that, the developer needs to create a Data.php file in the app/code/[Vendor]/[Module]Helper directory with a few lines of code.
You can get the complete code at https://meetanshi.com/blog/reindexing-programmatically-in-magento-2/
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