Non-targetable

Untargetability is a mechanic that makes the unit untargetable.

Unselectability
Unselectablity makes the unit not selectable, and selectable only in a few cases. Unselectable units do not have a Hitbox and they have attack immunity, with both allies and enemies being unable to target them. Although Hide sources also cause the unit to be unselectable and untargetable, they are considered a different mechanic.

Unlike with invisibility, attached units and do not instantly die when the target is no longer selectable.

Spell Reflection sources, including can still cast abilities on unselectable units.

Almost every ability treats unselectable units as if they were invisible, except the following sources:

Others
The following sources make the unit selectable. However, they cannot be targeted by allies or by enemies. Does not prevent self-casting or double any abilities as well.

Grants attack immunity with different ability interactions stated in their respective ability notes.

 

Castable Target Unit Abilities
can be targeted through the hero portraits at the top of the screen with instant cast abilities. These abilities can be cast without having to face the targeted unit.

Other Unselectability is almost untargetable for all abilities.

Spell Reflection and Spell Duplicate can still cast abilities on Unselectability.

Unilateral Untargetability cannot be targeted by only allies abilities except while channeling and. Also cannot prevent the affected enemies from self-casting and double any abilities.

Non-targetable