A graph in the context of computer science and technology is a network of entities and how they relate to each other, consisting of nodes and relationships. It's a mental model that can resemble a list, a tree, a map, or any other structured entity. Graphs were first studied by Leonhard Euler in 1735 as part of the Königsberg bridge problem, and since then have been applied in various fields such as computer science, chemistry, social sciences, and database management. The graph data model is used to store and query data in a more flexible and efficient way than traditional relational databases, allowing for connection-oriented queries and enabling companies like Google, Facebook, LinkedIn, and PayPal to build their business empires. Graph technology offers agility, flexibility, and performance, making it the future of innovation and simplifying complex connections between entities.