Chrome Web Store
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Chrome Web Store is a Google site that allows developers to publish add-ons to the Chrome browser. These include both extensions and apps.
Google has announced a timeline of policy changes that will lead to content being removed between December 1, 2020 and June 2022.
A Chrome app is a web application that runs on the Chrome browser. These were originally supported on Windows, Mac, Linux, and Chrome OS, but support on all but Chrome OS is now very limited. Google removed the apps section of the store for Windows, Mac, and Linux in December 2017, though it is still possible to install apps on these platforms with a direct link. 
March 2020: Chrome Web Store stopped accepting new public Chrome apps. Developers will be able to update existing Chrome apps through June 2022. Enterprise administrators may continue to submit new private and unlisted Chrome apps to the Chrome Web Store.
June 2021: General support for Chrome Apps on Windows, Mac, and Linux will end June 2021. Organizations will be able to use a policy setting to extend support on Windows, Mac, and Linux through June 2022. General support for Chrome Apps on Chrome OS will remain enabled, without requiring any policy setting, through June 2022.
June 2022: Chrome Web Store will stop accepting new and updated private and unlisted Chrome apps. End support for Chrome Apps, NaCl, PNaCl, and PPAPI for all platforms.
Chrome extensions add functionality to the browser. Google has announced that it is shutting down its payment system for paid extensions. Free trials for paid extensions will end on December 1, 2020, and all payment support will end on February 1, 2021. Many such extensions have a free base version with in-app purchases.