In Java, a static variable is a class-level variable shared by all instances of the class rather than each instance having its own copy. Defined using the static keyword, this variable belongs to the class itself and is initialized only once when the class is loaded into memory, regardless of how many objects of that class are created. Since static variables hold the same value across all instances, they are useful for defining common properties or values that need to be accessed and modified by all objects, such as a counter tracking the number of instances. Static variables can be accessed directly using the class name (e.g., ClassName.variableName), making them easily accessible without needing an object reference, which enhances memory efficiency and simplifies code when a shared, unchanging property is required across all instances of a class.
