Which key is used to select multiple objects so they can be grouped?

To select multiple objects for grouping, you typically hold down the Ctrl key (or Command key on a Mac) while clicking on each object you want to include. This allows you to select multiple non-contiguous items. If the objects are contiguous, you can click and drag to create a selection box around them while holding down the left mouse button. Once selected, you can group the objects using the appropriate command in your software.