HowItFlows is the place for visual learners. Animated explorers show every message, hop and handshake inside the data and cloud systems you use every day, step by step, with working code to try yourself.
Watch 10 databases connect, authenticate, query and replicate on the wire, then grab working code in 7 languages.
Producers, brokers, partitions and consumer groups: follow a record from send to commit, through acks and rebalances.
A row changes in Postgres, and the change rides the WAL into Kafka and lands in your warehouse.
SQL in, results out: parsing, planning, optimizing, stages and the shuffle, animated.
How a commit becomes snapshots, manifests and data files, and how time travel and compaction work.
Scheduler, executor and workers: watch a DAG run, retry and backfill.
One request through DNS, load balancers, subnets, NAT and private endpoints, compared across clouds.
Token exchanges you can see: OAuth, OIDC, STS role assumption and workload identity.
kubectl apply → API server → etcd → scheduler → kubelet: the life of a pod.
Raft elections, quorums and consistent hashing. Kill a node and watch the cluster recover.
An animated topology shows each packet travelling between your app, servers, disks and replicas.
Scrub the timeline message by message. Every step explains what happens and why, with the real protocol details.
Generate working code for your own connection settings: connect, create a schema, seed data and run CRUD, in 7 languages.
Failure injection: kill a node or cut the network and watch the system fail over. Cross-links: follow one write from Postgres, through change data capture and Kafka, all the way to your warehouse.