Coordinates

Coordinates numerically represent your location in a Minecraft world. They are based on a grid where three lines or axes intersect at the origin point. Players initially spawn within a couple hundred blocks of the origin point. thereby forming a right-handed coordinate system (thumb≡x, index≡y, middle≡z), making it easy to remember which axis is which.
 * The x-axis indicates the player's distance east (positive) or west (negative) of the origin point—i.e., the longitude,
 * The z-axis indicates the player's distance south (positive) or north (negative) of the origin point—i.e., the latitude,
 * The y-axis indicates how high or low (from 0 to 255, with 64 being sea level) the player is—i.e., the elevation,

Displaying coordinates
Pressing (or  on Macs and some laptops) brings up a debug screen with various data—including your current coordinates, at the top left of the screen. On new Macs, however, the keystroke does not display coordinates. Use instead.

Coordinates first appeared on the debug screen in Alpha 1.2.3.

On Console Edition, the coordinates can be found on any map item.

On Pocket Edition 1.2, it is toggle-able as a cheat and is displayed in a box in the top left

On New Nintendo 3DS Edition, the coordinates are displayed on the Touch Screen.

Interpreting coordinates
The origin point marks the zero point for the x and z coordinates. Hence, it may be thought of as the 0,0 coordinate: As you travel south, the z-axis number increases; travel north and it decreases. Similarly, the x-axis number increases as you travel east and decreases as you travel west.
 * x-axis = 0
 * z-axis = 0

One coordinate number equals one block. And, in terms of real-world measurement, one block equals 1 cubic meter.

As your elevation rises, the y-axis number increases, and as your elevation lowers, that number decreases.

The y coordinate works a bit differently than the x and z coordinates in terms of spawning. Typically, you do not spawn at y-coordinate 0. Instead, y=63 is the Overworld water sea level, y 31 is the Nether lava sea, and y 11 is the overworld lava flood sea. To clarify: When the display shows your Y=63, then your feet are at Y=63, your legs are approximately 63.5 and your eyes are at 64.62, and you are out of the water; when the display shows your Y=62, then your head is in the Y=63+ block, your feet are in the Y=62 block, your feet may be wet and your head is dry. The top of the water is Y=63 (actually, slightly higher than Y=62.9). For lava, the top of the overworld lava is 11, and if your Y is 10 then your feet may be burning.

With these numbers in mind, we can see that the player's debug screen above locates him or her at (ignoring the numbers after the decimal point for simplicity): Facing: south
 * x: 0 = 0 east/west
 * y: 5 = 5 above the bottom of the game environment
 * z: 0 = 0 south/north

Coordinate usage
Coordinates may be put to a variety of uses.

Once players establish bases, they should note their coordinates before going exploring. If they get lost or respawn they can find their way back to their bases by walking to those coordinates. Also you can (on creative) get Command Blocks and put the coordinates in it. It will then take you to the place that match the coordinates you put in the command block.

Coordinates are often used when sharing level seeds to give directions on where to go to find things.

However, coordinates can be disabled by server admins using the command

In that case the coordinates section looks like following:

Coordenadas Координаты 坐标