ArrayPlot

ArrayPlot[array] generates a plot in which the values in an array are shown in a discrete array of squares.

Examples

Visualize a 2D array:

ArrayPlot[{{1, 0, 1}, {0, 1, 0}, {1, 0, 1}}]

Plot random data:

ArrayPlot[RandomReal[1, {20, 20}], ColorFunction -> "Rainbow"]

Please visit the official Wolfram Language Reference for more details.