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Data Structures/AI Notes/Questions & Definitions.md

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+## What is an interface?
+- An interface is a device or a system that unrelated entities use to interact.
+	- A remote control is an interface between you and a television set.
+
+basically the interface has and abstract method which classes have to implement the method to make it 'real'.
+
+Concert realisation of the otherwise abstract method.
+
+
+
+
+## What is a linked list?
+
+- On the linked list every node is an object.
+- Has more memory overhead than an ArrayList.
+- Each node holds both data and the address of next and previous node.
+- It mainly allows efficient *insertion* and *deletion* operations compared to arrays
+- Its dynamic, the size of it changes with every change.
+
+# Protected 
+prevents the method to be used by anyone but its sub classes.
+