Photoshop/101basics/The Basics/Workspace/menubar/layer/layers effects/stroke

=> Photoshop Tutorials => Photoshop 101 - The Basics 
=> Photoshop Layers Basics ==> Layers Style Effects ==> Stroke Layer Effect

Stroke Layer Effect

Size The size of the stoke

Position The stroke can be applied to the outside, inside, or center of the layer.

Blend Mode

Opacity This determines the density of the stroke

Fill Type You can fill the stroke with a color, a pattern, or a gradient.

Color Here you choose the color of the stroke

Preview this gives you an idea of how the stroke is applied.

Sample of the stroke effect