What is roasting?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Roasting**: Roasting is a metallurgical process in which an ore is heated in the presence of air. This process is primarily used to extract metals from their ores.

2. **Process Description**: During roasting, the ore is subjected to high temperatures, which causes chemical reactions to occur. The presence of air (oxygen) is crucial as it facilitates the oxidation of certain compounds within the ore.

3. **Common Types of Ores**: Roasting is typically applied to sulfide ores. These ores contain sulfur and are often converted into oxides through the roasting process.

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