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Kong is meant to replace nginx or HAproxy but with additional functionality added as plugins. For example you could proxy any APIs or microservices and add authentication, rate-limiting and logging as plugins.

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Nginx can also be extended with modules and Lua scripts, which can add authentication, rate-limiting and logging.

EDIT: It seems Kong doesn't really replace Nginx, it's actually a set of Lua scripts for Nginx.

Even though Kong uses Nginx under the hood as a user you interface with Kong through the CLI or REST API and don't deal directly with Nginx or it's config files. While Kong is a mix of Nginx + Lua + Cassandra it's meant to take the place Nginx in your software stack.

Correct. Kong is Nginx on steroids (w/ Lua + Cassandra) for managing microservices.

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