A landrush period is the time during which domain name

Domain name

A domain name is an identification string that defines a realm of administrative autonomy, authority, or control in the Internet. Domain names are formed by the rules and procedures of the Domain Name System ....

s are available for registration, usually to a closed group, to entities that do not own a trademark in the name they wish to register, for example generic terms like loan or car, and thus would not qualify for registration during the sunrise period

Sunrise Period

A sunrise period is a period of time after the launch of a new top-level domain or second-level domain during which owners of trademarks may register a domain name containing the owned mark....

. Orders may or may not be treated on a first-come-first-served basis. This period follows the sunrise period

Sunrise Period

A sunrise period is a period of time after the launch of a new top-level domain or second-level domain during which owners of trademarks may register a domain name containing the owned mark....

 just after the launch of a new top-level domain or second-level domain during which, for example, owners of trademark

Trademark

A trademark, trade mark, or trade-mark is a distinctive sign or indicator used by an individual, business organization, or other legal entity to identify that the products or services to consumers with which the trademark appears originate from a unique source, and to distinguish its products or...

s may register a domain name containing the owned mark, but a landrush period precedes a period of general availability, when any qualifying entity can register any name on a first come first-served basis.