Caves are an integral terrain feature in Minecraft. The Overworld dimension is filled with pockets of differently shaped caves. Soon after players spawn in a new world for the first time, they will stumble upon a cave opening and feel the urge to explore it further. Since the game literally has the word 'mine' in it, heading into a cave and gathering precious underground resources feels like natural progression.
Hence, Mojang, who created the sandbox 15 years ago, continued to work hard on making the caves more alluring than ever in recent Minecraft updates.
Note: Parts of this article are subjective and solely reflect the writer's opinion.
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Ways in which Minecraft caves have massively improved
Much deeper and massive cave generation

In 2020, Mojang released the Nether update and completely overhauled the hellish dimension. After the Nether's revamp, the developers turned towards the Overworld. For the past five years, they have continued to add changes to Minecraft's first dimension.
The first major step they took to update the Overworld was with the Caves and Cliffs update. In 1.17 and 1.18 updates, they brought massive changes to cave generation.
They started by deepening the cave system from Y level 0 to -64. This meant adding 64 vertical levels to the Overworld's underground areas. With this massive change, they also revamped the ore distribution, completely changing the meta for ore hunting.
This gave Mojang a lot more real estate to play with. The company subsequently came up with the idea to generate massive caves. These ultra-large cavities underneath the ground were a sight to behold whenever players stumbled into one. Although different from the Overworld, it gave the feeling that players were in a completely new dimension.
These new cave systems urge them to step ahead and venture into the unknown to discover something new.
New cave biomes and structures

After expanding the cave system drastically, Mojang could not keep the new caves the same as the old ones. Hence, they added more character to the underground world by incorporating new cave biomes and structures.
In 1.17, 1.18, and 1.19 Minecraft updates in 2021 and 2022, Mojang brought three new cave biomes: Lush Caves, Dripstone Caves, and Deep Dark. All three of these regions were unique and offered something special.
The Lush Caves had lots of vegetation like moss blocks, azalea bushes, and glow berries accompanied by cute axolotls.
The Dripstone Caves were pitch dark and had pointy dripstones on both the ground and ceiling, making it difficult for players to traverse through them.
The Deep Dark biome was a spooky region plagued with mysterious sculk blocks. It became the most challenging biome in the Overworld because of the warden, a terrifying blind beast that spawns with the help of sculk blocks. The mob spawned if explorers were too noisy and could obliterate them with a single hit.

Mojang also added new underground structures like Ancient City and Trial Chambers that posed a tougher challenge to more seasoned Minecrafters.
The Ancient City was a vast ruined structure deep underground infested by sculk. It had some of the most valuable loot in the entire game, but also spawned the warden since it was connected to sculk blocks.
The Trial Chamber was a well-made underground fortress filled with trial spawners that spawned all kinds of hostile mobs. It also had a decent reward for players in the trial vaults if they managed to defeat mobs from the trial spawners.
These cave biomes and structures have added a lot of character to Overworld's underground realm, making it more attractive.
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