Indexer(s)

Indexing is the process of transforming data by reducing it to flattened data with less database tables. This process is run for products, categories, and so on in order to improve the performance of a web store. Since data constantly changes, this is not a one-time process. Rather, it is a periodic one. The Magento_Indexer module is a base of the Magento Indexing functionality.

The Magento console tool supports the following indexer commands.

indexer
    indexer:info        Shows allowed Indexers
    indexer:reindex     Reindexes Data
    indexer:set-mode    Sets index mode type
    indexer:show-mode   Shows Index Mode
    indexer:status      Shows status of Indexer

On running php bin/magento indexer:info, you will get a list of all the Magento indexers; the default ones are as follows:

catalog_category_product    Category Products
catalog_product_category    Product Categories
catalog_product_price       Product Price
catalog_product_attribute   Product EAV
foggyline_office_employee...