The King County Library System (KCLS) is a library system serving the residents of King County, Washington, United States.

Headquartered in Issaquah, Washington, KCLS is currently the busiest library in the United States, circulating 22.4 million items in 2010.

It consists of 48 libraries, a Traveling Library Center, a mobile TechLab, and the ABC Express children’s library van.

KCLS offers a collection of more than 4.1 million items, including books, periodicals, newspapers, audio and videotapes, films, CDs, DVDs and extensive online resources.

All KCLS libraries offer free Wi-Fi connections.

A library catalog or library catalogue is a register of all bibliographic items found in a library or group of libraries, such as a network of libraries at several locations.

A bibliographic item can be any information entity (e.g., books, computer files, graphics, realia, cartographic materials, etc) that is considered library material (e.g., a single novel in an anthology), or a group of library materials (e.g., a trilogy), or linked from the catalog (e.g., a webpage) as far as it is relevant to the catalog and to the users (patrons) of the library.

or pupil is a learner or someone who attends an educational institution.

In Britain those attending university are termed "students".

In the United States, and more recently also in Britain, the term "student" is applied to both categories.

In its widest use, student is used for anyone who is learning, including mid-career adults who are taking vocational education or returning to university.

When speaking about learning outside an institution, "student" is also used to refer to someone who is learning a topic or who is "a student of" a certain topic or person.

Homework, or a homework assignment, is a set of tasks assigned to students by their teachers to be completed outside the class.

Common homework assignments may include a quantity or period of reading to be performed, writing or typing to be completed, math problems to be solved, material to be reviewed before a test, or other skills to be practiced.