What Is TLD (Top-Level Domain)?
A TLD (Top-Level Domain) is the rightmost segment of a domain name — the part after the final dot. In nicename.me, the TLD is '.me'. In google.com, it's '.com'. TLDs are the highest level in the hierarchical Domain Name System.
TLDs are categorized into several types: gTLDs (generic — .com, .net, .org, .app), ccTLDs (country code — .uk, .de, .io, .ai), sTLDs (sponsored — .edu, .gov, .mil), and infrastructure TLDs (.arpa). There are currently over 1,500 TLDs available.
The choice of TLD significantly impacts a domain's perception, value, and functionality. The .com TLD carries universal recognition and the highest aftermarket values, while specialized TLDs like .ai or .io can signal industry focus. Some TLDs require HTTPS (.app, .dev), and some restrict registration to certain entities (.edu, .gov).
Why This Matters for Startups
Your TLD choice shapes first impressions. For broad consumer appeal, .com is safest. For tech startups, .io and .ai are well-recognized. For developer tools, .dev is a natural fit. For specific countries, local ccTLDs build trust. Don't overthink it — the TLD matters less than the SLD (the name you choose). A strong name on any reputable TLD beats a weak name on .com. Browse our TLD guides in this dictionary for detailed breakdowns of each extension.
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