þar

In a sentence

• Hún býr þar.

  She lives there.

  Here, "þar" indicates a specific place or location where someone lives.

• Þar var mikið um að vera í gær.

  There was a lot happening there yesterday.

  In this case, "þar" describes a place associated with certain events or activities.

• Þeir hittust þar sem við skilduðum eftir bílinn.

  They met where we had left the car.

  Here, "þar" is part of the compound phrase "þar sem" and provides a conjunction introducing the location or situation of the meeting.