The dash is a sign used to include some words in a sentence for explanation.

They visited several cities-California, Los Angeles, New York.
The new taxes -on oil, house and medicines-are the talk of the town.

1. The dash is used to indicate the connecting years or items of a whole unit.

The history of America covering the 1950-2010 period.
Pages 1-150 of the Five-Year Plan.
Classes 1-6
September-December session.

2. The dash is used to indicate something left out.

-is what all of us desire. (money and fame)

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