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. Most abilities/items treat unselectable units as if they were invisible, except a few cases. Some sources of unselectability may remove a unit's Hitbox, grant attack immunity, may prevent allies or enemies or both from targeting them.

Although Hide sources also cause the unit to be unselectable and untargetable, they are considered a different mechanic.

Unit targeting abilities
While most unit targeting abilities cannot target unselectable units, there are a few particular exceptions. Certain abilities that can be cast without having to face the targeted unit, can also target units that was granted unselectability (ignore/bypass the unselectability) from, and.

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

Non unit targeting abilities
Additionally, most abilities/items also treat unselectable units as if they were invisible. Ability that does not affect invisible unit also does not affect unselectable units. For example,
 * does not bounce to invisible units and unselectable units.
 * does not strike invisible units and unselectable units.

There are also a few exceptions to this, as following.

These abilities do not consider unselectabilities from all sources as invisibility:

These abilities do not consider unselectabilities from, as invisibility:

Unlike with invisibility, attached units and do not instantly die when the target is no longer selectable. does not damage or slow unselectable units.

Non-targetable