Explain the difference between 'principal' and 'principle'.

The words 'principal' and 'principle' are often confused due to their similar spellings and pronunciations. However, they have different meanings and usage in the English language.

1. Principal:
- As a noun, 'principal' refers to a person who holds a high position of authority, such as the head of a school or an organization. For example, "The principal of the school addressed the students during the assembly."
- It can also refer to the original sum of money invested or loaned, excluding any interest or additional amounts. For instance, "The principal amount of the loan was $10,000."
- As an adjective, 'principal' describes something that is primary, main, or most important. For example, "The principal reason for his success was hard work."

2. Principle:
- 'Principle' is a noun that refers to a fundamental truth, law, or belief that serves as the foundation for a system of thought or behavior. It represents a guiding rule or standard. For instance, "Honesty is a principle that should be upheld in all aspects of life."
- It can also refer to a basic truth or concept in a particular subject or field. For example, "The principles of physics explain the behavior of matter and energy."

In summary, 'principal' typically refers to a person in authority, the main sum of money, or something that is primary or most important. On the other hand, 'principle' refers to a fundamental truth, belief, or guiding rule. It is essential to understand the distinction between these two words to ensure accurate usage in writing and communication.