What does Isaiah 14:4-21 mean?

you will take up this taunt against the king of Babylon: “How the oppressor has ceased, the insolent fury ceased! The LORD has broken the staff of the wicked, the scepter of rulers, that struck the peoples in wrath with unceasing blows, that ruled the nations in anger with unrelenting persecution. The whole earth is at rest and quiet; they break forth into singing. The cypresses rejoice at you, the cedars of Lebanon, saying, ‘Since you were laid low, no woodcutter comes up against us.’ Sheol beneath is stirred up to meet you when you come; it rouses the shades to greet you, all who were leaders of the earth; it raises from their thrones all who were kings of the nations. All of them will answer and say to you: ‘You too have become as weak as we! You have become like us!’ Your pomp is brought down to Sheol, the sound of your harps; maggots are laid as a bed beneath you, and worms are your covers. “How you are fallen from heaven, O Day Star, son of Dawn! How you are cut down to the ground, you who laid the nations low! You said in your heart, ‘I will ascend to heaven; above the stars of God I will set my throne on high; I will sit on the mount of assembly in the far reaches of the north; I will ascend above the heights of the clouds; I will make myself like the Most High.’ But you are brought down to Sheol, to the far reaches of the pit. Those who see you will stare at you and ponder over you: ‘Is this the man who made the earth tremble, who shook kingdoms, who made the world like a desert and overthrew its cities, who did not let his prisoners go home?’ All the kings of the nations lie in glory, each in his own tomb; but you are cast out, away from your grave, like a loathed branch, clothed with the slain, those pierced by the sword, who go down to the stones of the pit, like a dead body trampled underfoot. You will not be joined with them in burial, because you have destroyed your land, you have slain your people. “May the offspring of evildoers nevermore be named! Prepare slaughter for his sons because of the guilt of their fathers, lest they rise and possess the earth, and fill the face of the world with cities.”