PowerApps is part of the Power platform along with Power BI and Flow that you can use to build business mobile device applications for your business to work with your data from applications like SQL, Excel, SharePoint, storage sources e.g. One Drive, Azure, third sources like Salesforce, Dropbox, Google Drive and many other sources.
PowerApps is available to users with an Office 365 or Dynamics 365 subscription or with a standalone PowerApps Plan 1 or 2 subscription with additional features.
PowerApps integrates with Power Automate so you can trigger flows from within PowerApps
Using PowerApps you can create Canvas apps and model driven apps with forms, charts and maps.
More to follow.