All

is a setting used for certain options. In Part and related functions, All specifies all parts at a particular level.

Details

For example, PlotRange->All specifies that all points are to be included in a plot.

Use Part to extract the first column vector:

Wolfram Language code: {{1, 2}, {3, 4}}[[All, 1]]

Use Take to extract the column matrix:

Wolfram Language code: Take[{{1, 2}, {3, 4}}, All, {1}]

Normally, plots drop outlying points:

Wolfram Language code: Plot3D[Exp[-x ^ 2 - y ^ 2], {x, -3, 3}, {y, -3, 3}]

Choose the range to show all the existing points:

Wolfram Language code: Plot3D[Exp[-x ^ 2 - y ^ 2], {x, -3, 3}, {y, -3, 3}, PlotRange -> All]

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