Etsy is an online marketplace that connects buyers and sellers from all around the world. It specializes in handmade and vintage products, as well as unique factory-manufactured items. With millions of active users, Etsy provides a global platform for small and independent businesses to sell their products and reach a broader audience. Etsy's platform includes features such as seller ratings, buyer reviews, and personalized recommendations, which help to ensure a safe and reliable buying experience. Etsy is a trusted and established platform that supports creativity and entrepreneurship, providing a comprehensive suite of tools and resources for businesses to succeed in the e-commerce world.

Apache Kafka is a distributed event store and stream-processing platform. It is an open-source system developed by the Apache Software Foundation written in Java and Scala. The project aims to provide a unified, high-throughput, low-latency platform for handling real-time data feeds. Kafka can connect to external systems (for data import/export) via Kafka Connect, and provides the Kafka Streams libraries for stream processing applications.