What does Psalm 105:23-36 mean?

Then Israel came to Egypt; Jacob sojourned in the land of Ham. And the LORD made his people very fruitful and made them stronger than their foes. He turned their hearts to hate his people, to deal craftily with his servants. He sent Moses, his servant, and Aaron, whom he had chosen. They performed his signs among them and miracles in the land of Ham. He sent darkness, and made the land dark; they did not rebel against his words. He turned their waters into blood and caused their fish to die. Their land swarmed with frogs, even in the chambers of their kings. He spoke, and there came swarms of flies, and gnats throughout their country. He gave them hail for rain, and fiery lightning bolts through their land. He struck down their vines and fig trees, and shattered the trees of their country. He spoke, and the locusts came, young locusts without number, which devoured all the vegetation in their land and ate up the fruit of their ground. He struck down all the firstborn in their land, the firstfruits of all their strength.

English Standard Version (ESV)