Selections and masks are subtly different, and the ‘parametric’ masks in non-destructive editors give more flexibility than ever.
Lasso tool
A simple freehand tool for selecting parts of a photo. You drag the lasso pointer around the object or area you want to select and it's enclosed by a 'marching ants' outline. Freehand selections are quick but inaccurate – it depends on how good your mouse control is!