Fault tolerance in cloud architecture ensures that systems continue operating even when some components fail. Cloud platforms implement fault tolerance through redundancy, automatic failover, data replication, and distributing workloads across multiple availability zones or regions. Major providers like Amazon Web Services, Microsoft Azure, and Google Cloud offer tools and services to help build highly available and resilient applications. Key considerations for fault-tolerant design include system resilience, load balancing, continuous monitoring, and disaster recovery planning, all of which help ensure applications remain stable, reliable, and accessible even during unexpected failures.