What does it mean by anchoring of controls?

An anchoring is the property of the control to keep a specific distance with a particular edge of the window (or other containing control). You can anchor a control to any edge or side of the window, e.g., left, top, right, bottom, left and top, etc. If a control is anchored to the left of the window, it will keep the constant distance from the left side of the window; even when the window is resized. The constant distance that the control will keep with the window is the distance it has at the form startup or defined by its Location property. In the figure below, the button is anchored to the top edge of the window.

When the window is resized, it shifts itself on the form to keep the same distance from the top, see the figure below:

If we have defined the top and bottom anchoring and the form is resized, the control will resize itself to have the same distance from top and bottom. Consider the figure below; here the button is anchored top and bottom

When the form is resized, the button resizes itself to keep the same distance from top and bottom

The default anchoring of a control is left and top.

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