- ccTLD
A ccTLD (country code top-level domain) is a top-level domain with two letters that is assigned to a country or territory, such as .de for …
- Domain
A domain name is a text label such as example.com that identifies a host on the internet and maps, through the Domain Name System (DNS) …
- Dynamic URL
A dynamic URL contains parameters that the server evaluates before it returns the page, for example /product?id=12&color=red.
- Fragment identifier
A fragment identifier is the last part of a URL, starting with the # character.
- Mirror site
A mirror site is a replica of a website hosted on a different server under a different URL.
- Query string
The query string is the part of a URL that starts with a question mark (?) and carries additional data as key and value pairs.
- SEO-friendly URL
An SEO-friendly URL (also called a clean or readable URL) is an address that uses readable words to describe the page, so people and …
- Session IDs in URLs
A session ID in a URL is an identifier that links requests to one visitor session and is appended to the address, for example ?sid=a1b2c3.
- Static URL
A static URL is an address without parameters, for example /shoes/sneakers.
- Subdirectory
A subdirectory (also called a subfolder) is a section of a website that sits in the path of the same domain, for example example.com/blog/.
- Subdomain
A subdomain is a name placed in front of a domain, separated by a dot, for example blog in blog.example.com.
- Top-level domain (TLD)
A top-level domain (TLD) is the last label of a domain name, the part after the final dot, for example com in example.com.
- Trailing slash
A trailing slash is the forward slash at the end of a URL, as in https://example.com/foo/.
- URL
A URL (Uniform Resource Locator) is the address of a unique resource on the web, such as an HTML page, an image or a document.
- URL case sensitivity
URL case sensitivity describes whether uppercase and lowercase letters in a URL count as different.
- URL hijacking
URL hijacking is another name for typosquatting: registering domains that differ from a well-known brand's address only by a typing …
- URL parameters
URL parameters are key and value pairs added to a URL after a question mark.
- URL structure
URL structure is the way a website builds its addresses: protocol, host, path, and optional parameters.
- UTM parameters
UTM parameters are tags added to the end of a URL, such as utm_source and utm_medium, that tell an analytics tool which campaign, channel …
- Vanity URL
A vanity URL is a short, memorable web address that leads to a longer or more technical destination URL.
- WHOIS
WHOIS is a protocol and service for looking up registration data about domains and IP addresses, such as the registrar, name servers and …
- www vs. non-www
www vs. non-www is the choice between www.example.com and example.com as the main address of a website.