Multi-tenancy in computing dates back to the 1960s when companies shared mainframe resources. The concept evolved over time and is now prevalent in cloud computing with many services being multi-tenant, such as Salesforce, Google Docs, and Spotify. Multi-tenancy can be achieved through various methods like service/API, schema & data, or database separation. GraphQL combined with Hasura provides a significant advantage in developing applications that need multiple databases federated together via an API.