The Visitation represents a heavenly ambassador visiting us in this realm – a messenger from the Lord; angelic visitation.
“The angel of the Lord [angelic spokesperson for God, sometimes identified with the Lord himself] came and sat down under the oak tree at Ophrah that belonged to Joash, one of the Abiezrite people… Gideon, Joash’s son, was separating some wheat from the chaff [threshing/beating out wheat] in a winepress to keep the wheat from the Midianites [in a pit hidden from sight]. The angel of the Lord appeared to Gideon and said, “The Lord is with you, mighty [courageous] warrior!””Judges 6:11-12 (EXB)
“Do not neglect to show hospitality to strangers, for thereby some have entertained angels unawares.” Hebrews 13:2 (ESV)