The regular wizards use it to, let's say, make a door open when someone says "open" or other minor one-step commands.
The protagonist, a modern human stuck in a magical world, uses it differently. He creates sequences with it. He scripts complex programs.
[Minor Spoiler] As an example, he ends up creating a magical pistol. When the users speak "reload", the pistol (which the character imbued with a few spells using "enchant") casts a detection spell to finds the closest bullets. If bullets are found, the pistol then casts the spell "aports" on it. The bullets are teleported into the chamber of the pistol. He uses the same concept but with transmogrification enchantments to add voice commands such as "sword mode" or "pistol mode" that transform the pistol into a sword and vice-versa.
