What are polar dielectrics?

Explanation

**Step-by-Step Solution:**

1. **Definition of Dielectrics**:
Dielectrics are insulating materials that do not conduct electricity but can support an electrostatic field. They are used in capacitors and other electrical applications.

2. **Understanding Polar Molecules**:
Polar molecules are molecules that have a positive charge on one end and a negative charge on the other end. This separation of charge creates a dipole moment. An example of a polar molecule is water (H2O), which has a positive hydrogen end (H+) and a negative oxygen end (OH-).

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