What are connections in Shopify GraphQL objects and what do they represent?

[Cloud]

HiI would like to know what does Connections in Collections represent? For example: https://shopify.dev/docs/api/admin-graphql/2024-04/objects/Collection#connections which is part of https://shopify.dev/docs/api/admin-graphql/2024-04/objects/Collection#fields 

Why do we need Connections and what does this signify for a user?