Beginner
40 mins
Teacher/Student led
+25 XP
What you need:

Strong vs. Weak Passwords

In this lesson, you will explore what passwords are and why they matter for keeping your accounts safe. Learn to spot weak passwords that are easy to guess, and create strong ones that mix uppercase and lowercase letters, numbers, and symbols. Practise with quizzes, tools, and reflections to build secure habits.
Learning Goals Learning Outcomes Teacher Notes

Teacher Class Feed

Load previous activity

    1 - Introduction

    What is a password?

    A password is a secret word (or secret code) you use to get into an account — like a game account or a school website. It works like a key. If you have the key, you can open your account. If you don’t, you can’t get in.

    ⭐ Remember: Your password is a secret. It should be known by you (and sometimes a trusted adult).

    Why are passwords important?

    Passwords keep your account safe. If someone learns your password, they could:

    • Look at your private information.
    • Send messages pretending to be you.
    • Change your settings or lock you out.

    That’s why it’s important to choose a strong password that is hard for other people to guess.

    In this lesson, you will learn the difference between weak and strong passwords, and how to make a safer password for yourself.

    2 - Weak Passwords

    Understanding Weak Passwords

    A weak password is a password that is easy for someone else to guess. If your password is weak, someone could get into your account without permission.

    ⭐ Think: A weak password is like leaving your front door unlocked.


    What makes a password weak?

    • It’s short (too few characters).
    • It’s simple (easy words or number patterns).
    • It uses personal info (your name, pet name, birthday, school name).
    • It doesn’t mix characters (only letters or only numbers).

    Examples of weak passwords

    These are common weak passwords. They are weak because lots of people use them, or they are easy to guess:

    • 1234 — a simple number pattern.
    • password — a very common word.
    • Your name (like “alex”) — people who know you might try it.
    • Your pet’s name (like “fluffy”) — often easy to guess.
    • qwerty — keyboard letters in a row.

    Important: Avoid weak passwords so your account stays protected.

    Remember: choosing a weak password is like leaving your front door unlocked — it invites trouble!

    3 - Strong Passwords

    Understanding Strong Passwords

    A strong password is a password that is hard for other people to guess. Strong passwords help protect your accounts so only you can get in.

    ⭐ Think: A strong password is like a strong lock — it keeps your account safe.


    What makes a password strong?

    • It is long (at least 8 characters).
    • It mixes letters (uppercase and lowercase).
    • It includes numbers (like 4, 7, 9).
    • It can include symbols (like ! @ # $).
    • It is not personal (not your name, birthday, or school).

    Examples of strong passwords

    These are strong because they mix different types of characters and don’t look easy to guess:

    • BlueSky!23 — has letters, a symbol, and numbers.
    • HappyDog#456 — has letters, a symbol, and numbers.
    • StarJump@789 — long and mixed, so it’s harder to guess.

    Important: Strong passwords are safer because they are harder to guess and harder to crack.

    Think of a strong password like a sturdy lock on a treasure chest — it keeps your valuables protected!

    4 - Strong vs Weak Passwords

    Strong vs Weak Passwords

    Time to test what you’ve learned. For each password, choose Weak or Strong. You’ll get feedback and a short reason.

    ⭐ Reminder: Weak passwords are easy to guess (simple words or patterns). Strong passwords are longer and mix letters, numbers, and symbols.

    Password: 123456

    Password: password

    Password: BlueSky!23

    Password: abc123

    Password: HappyDog#456

    Password: letmein

    Great job! Practising helps you remember how to make strong passwords.

    5 - Most Commonly Used Passwords

    Common Passwords to Avoid

    Lots of people choose passwords that are easy to remember. The problem is: hackers know these passwords too. They try the most common passwords first, because they work on lots of accounts.

    ⭐ Quick tip: If a password is super common, it’s not safe. Your password should be unique.

    Why should we avoid these passwords?

    These passwords are used by lots of people, so they are easy to guess. If someone guesses your password, they could get into your account and pretend to be you, change your settings, or send messages from your account.

    Examples of common passwords

    Don’t use these as your password:

    • 123456
    • password
    • qwerty
    • abc123
    • iloveyou
    • sunshine
    • football
    • princess
    • welcome
    • monkey

    Even if they feel easy, they aren’t safe enough. A stronger password is one that is harder to guess and not on a common list.

    A unique password helps to keep your accounts secure — avoid these common ones.

    Unlock the Full Learning Experience

    Get ready to embark on an incredible learning journey! Get access to this lesson and hundreds more in our Digital Skills Curriculum.

    Copyright Notice
    This lesson is copyright of Coding Ireland 2017 - 2025. Unauthorised use, copying or distribution is not allowed.
    🍪 Our website uses cookies to make your browsing experience better. By using our website you agree to our use of cookies. Learn more