先ほど (sakihodo) means “a moment ago”

More examples

先ほど、先生から電話がありました。saki ho do sen sei ka ra den wa ga a ri ma shi ta

A moment ago, I received a call from my teacher.

Places an event shortly before the present, without specifying an exact time.

さっきsakki: Refers to a short time before the present in casual speech.
たった今tattaima: Refers to the moment immediately before the present.

今から少し前の時点を表すさま。ima ka ra suko shi mae no ji ten o arawa su sa ma

先ほど (sakihodo) is formed from 先 (saki, "before") and ほど (hodo, "extent"), expressing a limited period before the present.

For JLPT learners, 先ほど (sakihodo) is a useful formal expression for the recent past, while さっき (sakki) is more casual.