An estancia is like a big farm with lots of different animals and crops. Imagine you have a big garden with lots of different plants and flowers, but instead of just having plants, you also have cows, horses, and sheep that you take care of. This is what an estancia is like.
People who work on an estancia take care of all the animals and make sure they have enough food and water. They also help the plants and crops grow by watering them and making sure they get enough sunlight. These crops are then sold to people who need them to make things like bread or pasta.
Sometimes, people visit an estancia, just like they would visit a farm. They can see all the animals and learn about how they're taken care of. It's also a good place to go if you want to learn about where your food comes from and how it's grown.