They were remembered mostly for their size. Deuteronomy 2 says the Emims once lived in Moab’s land, “a people great, and many, and tall, as the Anakims,” and that the Moabites gave them that name. Genesis 14 shows an earlier moment, when Chedorlaomer and the kings with him struck the Emims at Shaveh Kiriathaim. Beyond these few lines, Scripture tells us little about them. What the passages do show is a pattern in Deuteronomy: older peoples lived in a land, were displaced, and others settled where they had been.
3 verses
And in the fourteenth year came Chedorlaomer, and the kings that were with him, and smote the Rephaims in Ashteroth Karnaim, and the Zuzims in Ham, and the Emims in Shaveh Kiriathaim,
The Emims dwelt therein in times past, a people great, and many, and tall, as the Anakims;
Which also were accounted giants, as the Anakims; but the Moabites call them Emims.
Matthew George Easton, 1897
Terrors, a warlike tribe of giants who were defeated by Chedorlaomer and his allies in the plain of Kiriathaim. In the time of Abraham they occupied the country east of Jordan, afterwards the land of the Moabites (Gen. 14:5; Deut. 2:10). They were, like the Anakim, reckoned among the Rephaim, and were conquered by the Moabites, who gave them the name of Emims, i.e., “terrible men” (Deut. 2:11). The Ammonites called them Zamzummims (2:20).
William Smith, 1884
(terrors), a tribe or family of gigantic stature which originally inhabited the region along the eastern side of the Dead Sea. They were related to the Anakim.