what is Variables in PowerApps?

 A variable is a temporary storage that can be defined and used anywhere within Power Apps. Variables are created and typed by default when they are displayed in the functions which define their values. Three types of Variables are available in PowerApps.

In a Microsoft Power App, variables are used to store data that can be used throughout the app. They can be used to store text, numbers, dates, arrays, and more. You can create variables in the Power App by going to the "File" menu and selecting "Variables". From there, you can create a new variable by clicking the "New" button and giving it a name and data type. You can then use the variable throughout your app by referencing its name, for example: 

In this example, the variable "myVariable" is being set to the string "Hello, World!" and then used to update the context of the app with a new variable called "message". You can then use the "message" variable in your app to display the text "Hello, World!".

To create a variable, we just need to run the function:

1. Set(global Variable, "Hello World")  
2. Update Context({context Variable:"Hello World"})  
3. Collect( collection Variable, "Hello World" )