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Beginner Topic 3 of 52 Data Structures

Linked Lists

Nodes chained by pointers allowing cheap insertion and removal.

How it works

Each node stores a value and a pointer to the next node. Inserting or removing after a known node is O(1), but finding the i-th element requires walking O(n).

Where it is used

Free lists, undo history, building queues.

Common pitfall

Poor cache locality makes them slower than arrays in practice; losing the head pointer leaks the list.

Where it fits in the course

Linked Lists is topic 3 of 52 in Data Structures, rated Beginner. It follows Dynamic Arrays. The next topic is Doubly Linked Lists.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Data Structures quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Linked Lists?
Nodes chained by pointers allowing cheap insertion and removal. It belongs to Data Structures and is a beginner-level topic.
Where do people use Linked Lists?
Free lists, undo history, building queues.
What is the most common mistake with Linked Lists?
Poor cache locality makes them slower than arrays in practice; losing the head pointer leaks the list.
What should I learn before this topic?
Start with Dynamic Arrays, the topic just before it in Data Structures.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Data Structures quiz. You can also explore Stack, Queue & Linked List in the Visual Lab.
Is Linked Lists hard to learn?
It is a Beginner topic, so it works as an entry point. If the terms are new, read the explanation twice and try the visualizer before the quiz.
How long does it take to learn Linked Lists?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Linked Lists?
Dynamic Arrays, Doubly Linked Lists, Arrays are closely connected. The full list is in the related topics section of this page.
What should I study after Linked Lists?
Continue with Doubly Linked Lists, the next topic in Data Structures.

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