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Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects.

The tags contain electronically stored information.

Passive tags collect energy from a nearby RFID reader's interrogating radio waves.

Active tags have a local power source such as a battery and may operate at hundreds of meters from the RFID reader.

Unlike a barcode, the tag need not be within the line of sight of the reader, so it may be embedded in the tracked object.

RFID is one method for Automatic Identification and Data Capture (AIDC).

Gulls, often referred to as seagulls, are seabirds of the family Laridae in the suborder Lari.

They are most closely related to the terns (family Sternidae) and only distantly related to auks, skimmers, and more distantly to the waders.

Until the 21st century, most gulls were placed in the genus Larus, but this arrangement is now known to be polyphyletic, leading to the resurrection of several genera.

An older name for gulls is mew, cognate with German Möwe, Danish måge, Dutch meeuw, and French mouette; this term can still be found in certain regional dialects.

A barcode is an optical, machine-readable, representation of data; the data usually describes something about the object that carries the barcode.

Originally barcodes systematically represented data by varying the widths and spacings of parallel lines, and may be referred to as linear or one-dimensional (1D).

Later two-dimensional (2D) codes were developed, using rectangles, dots, hexagons and other geometric patterns in two dimensions, usually called barcodes although they do not use bars as such.

Barcodes originally were scanned by special optical scanners called barcode readers.

Later applications software became available for devices that could read images, such as smartphones with cameras.

Computer software, or simply software, is that part of a computer system that consists of data or computer instructions, in contrast to the physical hardware from which the system is built.

In computer science and software engineering, computer software is all information processed by computer systems, programs and data.

Computer software includes computer programs, libraries and related non-executable data, such as online documentation or digital media.

Computer hardware and software require each other and neither can be realistically used on its own.

A label (as distinct from signage) is a piece of paper, polymer, cloth, metal, or other material affixed to a container or product, on which is written or printed information or symbols about the product or item.

Information printed directly on a container or article can also be considered labeling.