Area Nodes detect when things ENTER and EXIT them.
Area is usually paired with CollisionShape or CollisionPolygon to define the Area
Each Collision has a Shape resource to define the shape (usually a Square, Box, Circle or Sphere)
Note: This is the same structure you use for CharacterBody and StaticBody
A message appears and disappears as the player overlaps an object
Game Mechanics Suited to Area Nodes
Player activates a pressure plate
Attract items like coins when they're close.
Make an enemy pursue the player