Multitier architecture is a type of software architecture that is suitable to support enterprise-level client-server solutions. Multitier architecture divides an application into logical layers or tiers that are distributed among different servers or machines. Each tier performs a specific function or role and communicates with other tiers through well-defined interfaces. Multitier architecture can provide benefits such as scalability, performance, security, maintainability, and reusability for complex and large-scale applications.