deshalb

In a sentence

• Ich habe gestern lange gearbeitet, deshalb bin ich heute müde.

  I worked for a long time yesterday, therefore I am tired today.

  Deshalb is used here as a conjunctive adverb to introduce the cause-effect relationship between the two clauses.

• Es regnete den ganzen Tag, deshalb blieben wir zu Hause.

  It rained all day, therefore we stayed at home.

  Deshalb is conveying a consequence resulting from the situation mentioned in the first clause.

• Der Zug hatte Verspätung, deshalb kamen wir zu spät zum Treffen.

  The train was delayed, therefore we were late to the meeting.

  Deshalb links the reason (train delay) to its outcome (arriving late).