Crafting is the process of combining materials ("ingredients") into new items. It is one of the primary means of creating new weapons and tools and is thus generally indispensable for game progress. The entirety of an item's ingredients is called its recipe.
Crafting is done through the crafting bar, visible on the left side of the interface below the player's inventory, which presents all craftable items available to the player. Items will only appear in this list if the player has the ingredients in their inventory. Pressing the ⚒ Use / Attack button on an item in the list will consume its required ingredients and place the item on the cursor, from which it can be placed in the inventory. Holding the ⚷ Open / Activate button to craft a stackable item will begin to repeatedly produce the item until the stack is filled. Crafting takes no time, though there is a very small delay between the creation of items in a stack. The longer the button is held, the shorter this delay.
While many items can be crafted using only the materials in their recipes, most will require a crafting station to make their recipe available. Items that require a station will appear in the crafting bar while the player stands near the required item, requiring no interaction with the station. In this way, a player may craft from multiple nearby stations at once.