Cornstarch
Cornstarch is a starch or bread ingredient used for structure, body, or serving. Texture changes fast as it hydrates, cooks, or cools, so adjust moisture gradually.
Identity
Staple starch
Texture matters most.
Starches change quickly as they hydrate or cool. Cook or warm them to the texture the dish needs, and add moisture gradually until you see how much they absorb.
Reference image
Cornstarch reference image.

Source: Wikimedia Commons
Used In Recipes
Substitutions
Arrowroot Starch -> Cornstarch
3 tablespoons arrowroot starch or cornstarch
The source lists this as an alternative in the same ingredient row.
Source: Strawberry Rhubarb Crisp
Potato Starch -> Cornstarch
potato starch or cornstarch ((for rolling and dusting; or substitute regular flour if you‘re not freezing them))
The source lists this as an alternative in the same ingredient row.
Source: How to Make Gyoza Wrappers (Easy Homemade Recipe) 餃子の皮
Potato Starch -> Cornstarch
2 Tbsp potato starch or cornstarch ((plus more, if needed))
The source lists this as an alternative in the same ingredient row.