Hi Shanmuga Priya,

• Local variables are used to store data temporarily. 
• These stored values will be lost when you refresh the screen or navigate to other screens.
• These local variables are initiated to its default value when the page reloads.
• You can create local variables to the screens, client actions, server actions etc.,
• If the local variable is created in screen, then it is directly accessible inside the screen and the corresponding screen elements like client actions, data actions.
• But, if the local variable is created under the client actions inside the screen, that cannot be directly accessible by the screen.

Hope it helps.

Regards, 

Aravind M