What is meant by chiral or asymmetric carbon?

Explanation

### Step-by-Step Solution:

1. **Definition of Chiral Carbon**: A carbon atom is termed as chiral or asymmetric when it is bonded to four different atoms or groups of atoms. This unique arrangement allows for non-superimposable mirror images, which is a characteristic of chiral molecules.

2. **Understanding the Concept**: In simpler terms, if you can visualize a carbon atom that has four distinct substituents attached to it, that carbon is chiral. This means that if you were to create a mirror image of the molecule, the two forms (the original and the mirror image) would not be identical.

3. **Example of Chiral Carbon**: Let's consider the example of 2-bromobutane. The structure of 2-bromobutane can be represented as:
- CH3-CH(Br)-CH2-CH3
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