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Linked lists have many real-world uses and applications. Here are some of the main ones:

Dynamic Memory Allocation: Used where the amount of data is not fixed and can grow or shrink over time.
Image Viewer: Each image in a gallery can be a node in a linked list, allowing for "next" and "previous" functionality.
Back and Forward Function in Web Browsers: Each webpage visited is a node, allowing navigation through history.
Memory Management: Used by operating systems to manage free and allocated memory blocks.
Switching Between Multiple Applications: Used in process scheduling in multitasking operating systems (e.g., Round Robin Scheduling).
Music Player: Each song in a playlist can be a node, allowing for "next" and "previous" song functions.
Graceful Shutdown: Some systems use linked lists to track running processes to ensure they are all closed correctly during shutdown.
Routing Tables: Network routers use linked lists to create and maintain routing tables.
Weighted Graphs: Used to connect nodes and edges in graph data structures.
Polynomial Representation: In mathematics, each term of a polynomial can be stored as a node in a linked list.

Advantages of Linked Lists:

Dynamic Sizing: The size is not fixed and can change at runtime.
Ease of Insertion and Deletion: Adding and removing elements is simple as it doesn't require shifting other elements.
Less Memory Wastage: Memory is allocated only as needed.

Disadvantages of Linked Lists:

Slow Searching: Searching for an element can be slow as it must be done sequentially.
More Memory Usage: Each node requires extra memory for the pointer.
Entry Point: Access to elements always has to start from the first node as there is no indexing.