When you type any name, e.g, 'www.google.com', your computer "talks" to a DNS (Domain Name Server), which translates the string 'www.google.com' into at leaset one IP-address:
Addresses: 74.125.155.103, 74.125.155.106, 74.125.155.147, 74.125.155.104, 74.125.155.99, 74.125.155.105
Aliases:
www.google.com
If your computer does not have a working Internet connection, it cannot "talk" to the DNS-server.
If you spell the name incorrectly, the DNS-server will report "cannot give you an IP-address".
Contact your Internet Service Provider, to trouble-shoot your Internet connection.
Or, check for a computer-virus on your computer, which could be blocking your attempts to "talk" to the DNS server.
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