Most routers come with a default password from the manufacturer. The password is easy to guess and can be omitted entirely to easily access the router settings after purchase.
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It is recommended that you change the password after you first log in. If you do not change the password of your router, anyone who has access to it can change the settings and even lock you out.
This is a similar idea to a lock on your house. If someone buys your house but never changes the locks, your keys will always have access to their house. The same goes for your router: if you never change the key or password, anyone who knows the password can access your router.
New routers typically come with a default admin password that is easy to guess and remember. Default router passwords are listed in manuals, so if you have trouble setting up your router, you can consult the product manual to find the default password.
