Okay, let's imagine you are building a big castle. The gothic style of architecture means you want your castle to look really tall and pointy. There were a few things that led people to use this style of architecture when they built churches and castles long time ago.
Firstly, people back then believed in God very strongly and they wanted their churches to be as grand and majestic as they could be. So they built them really tall with lots of decoration, such as big stained glass windows to let in colourful light, and lots of arches and stone sculptures to make them look fancy.
Secondly, it was really important for people back then to show off how rich and powerful they were. Building something in the gothic style showed everyone that they had a lot of money and could afford to build something really extravagant and showy.
Lastly, the shape of the buildings in the gothic style was influenced by the materials that were available at the time. Most of the buildings were made of stone, and builders found that they could make taller buildings with thinner walls by adding a special design called a flying buttress, which supports the weight of the roof and walls.
So, that's why people used the gothic style of architecture! They wanted to show off how powerful and wealthy they were, and they wanted their buildings to be super grand and reach up to the sky.