Whereas
We use the conjunction whereas to indicate a contrast between two facts or ideas: He loves foreign holidays, whereas his wife prefers to stay at home.
Whereas most new PCs have several USB slots, older ones often only had one.
Warning:
Whereas means the same as while in sentences expressing contrasts. It does not mean the same as while when while refers to time: The south has a hot, dry climate, whereas/while the north has a milder, wetter climate.
The secretary took care of my appointments while I was away from the office.
Not: … whereas I was away from the office.
See also:
While and whilst
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