The word "whereas" is a conjunction used to introduce a clause that contrasts with the preceding statement or clause. It indicates a difference, a contrast, or a contradiction. Here are a few examples to illustrate its use:
1. The company wanted to expand its operations, whereas the employees were concerned about job security.
2. The book was praised for its engaging narrative, whereas the critics criticized its lack of historical accuracy.
3. He had planned to retire early, whereas his health issues forced him to reconsider.
In each of these examples, "whereas" introduces a contrasting point or a difference between two ideas or situations.