Espresso Systems focuses on blockchain technology to improve the efficiency and security of decentralized networks. Their main product, the Espresso Sequencer, is a network of nodes that enhances data availability and transaction ordering, allowing for faster and more secure processing. They serve clients in the blockchain and decentralized finance sectors, emphasizing interoperability with various blockchain rollups. The company's goal is to provide essential tools that enhance transaction efficiency and security in decentralized networks.