What is the standard for 1 meter?

The standard for 1 meter is defined by the International System of Units (SI) as the distance light travels in a vacuum in 1/299,792,458 seconds. This definition was established in 1983 and reflects the constant speed of light, which is a fundamental aspect of physics. The meter can also be realized through physical artifacts, such as a meter stick, but the definition based on the speed of light provides a more precise and universally applicable standard.