Freeform Pen Tool

As Simple As Photoshop > Tools > Freeform Pen Tool

The Freeform Pen Tool allows us to draw vector shapes and paths (shape outlines) automatically adding anchor points:

In the Toolbox, select the Freeform Pen Tool.
Choose on the Options bar drawing mode: to draw vector shape layers click button ; to draw paths (shape outlines) click button.
Draw in image window like with a pencil.
Click button on the Options bar to set the Curve Fit (the tool's sensitivity).
Option Magnetic converts the Freeform Pen to Magnetic Pen , automatically clinging to edges of contrast objects* .

*See also the Magnetic Lasso Tool.