I can't connect to my wifi, but other people are able to although I am able to connect to other peoples wifi in their homes. Any suggestions as to what is going on.

Question

I enter my wifi Password and my iPad gives me the message that it cannot connect to the wifi.  I know the password is correct and other people do access it. 
I have been able to access other peoples wifi with no problem.  Any suggestions as to what the problem could be?

Answer 1

If you have more than one device in your house, you may find that this kind of thing happens from time to time, and it happens when your router gives to another device the address previously used to route Internet traffic to your computer, meanwhile your computer still thinks it's using that same, old address.  The technical term for this problem is “IP address collision.”
In the short term, the fix is to power off (not sleep) all the devices in your home that connect to the Internet, along with your router and modem.  Leave everything off for at least a full minute, then power on your devices in the following order (and make sure each one is fully on and working properly before powering on the next item): modem, router, any devices that maintain a permanent connection to the Internet, devices that only sometimes connect to the Internet (such as laptop computers or cell phones).  This process will clear out the routing tables and make all devices connect from scratch.
In the long term, you'll want to make sure each device that only sometimes uses your internet connection uses an assigned IP address when at home.  For Macs, you can use the location feature of the Networking pane in System Preferences to make this happen.  For other devices, you'll want to consult the user manual, or (probably) Google, Wikipedia, or YouTube.