Quick meaning
A prefix added before a domain name to create a separate section of a website, like help.example.com.
Think of it like this
Like different departments in a building — same address but different doors.
Where you may see this
You may see this when reading websites, browsing settings, or following basic online instructions.
Why it matters
Knowing this word makes everyday web tasks feel less intimidating and helps you follow step-by-step guides more confidently.
Say it simply
Subdomain means: A prefix added before a domain name to create a separate section of a website, like help.example.com.