Skills are purchasable abilities in The Elder Scrolls Online. New skills are unlocked and learned by leveling the skill set by using the skill's weapon, having the skill slotted on your primary slot-bar, and spending skill points.
There are both "Active" and "Passive" skills in the game. Active skills are assigned a slot in the ability bar, and must be activated by pressing a certain button. Passive skills give the player a constant and permanent effect. Some passive skills only affect a certain skill line, and will only provide bonuses in its regards.
Active skills can also be morphed. Morphing a skill will turn it into a more powerful version of itself. With sufficient skill progression, the Vestige will be allowed to spend a skill point and do this.
Currently, skills will feature two "Morph" choices. Morphing a skill will usually add extra effects, make a certain effect more powerful, increase the range or area of an attack, or make the skill consume less stamina or magicka when activated.
Passive skills will not Morph, but more than one skill point can be put into these, which will increase the effectiveness of that passive skill.