Charles Arthur explains the key terms What are top-level domains? TLDs are the part of an internet address â before the first single slash, and after a full stop (such as .uk in www.guardian.co.uk) that tells you what sort of site you are visiting. There are about 250 country-level codes - such as .uk, .us or .de for Germany - and 21 "generic" TLDs (gTLDs) that go across the net â such as .com ...
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