WooCommerce is an E-commerce platform available as a plugin for WordPress. It allows website owners to easily create and manage an online store by seamlessly integrating E-commerce functionalities into an existing WordPress site.

As one of the most popular E-commerce systems, WooCommerce offers a wide range of features including:

1. Product Management: Easy management of products, product variants, inventory, pricing, etc.
2. Payment Processing: Supports various payment methods like credit cards, PayPal, bank transfers, and more.
3. Shipping Options: Flexible options for shipping costs, shipping labels, tracking, and integration with various shipping services.
4. Marketing and Reporting: Tools for creating discounts, promotions, sales reporting, customer analytics, and more.
5. Extensibility: Through a variety of plugins and extensions, WooCommerce's functionality can be expanded and tailored to specific needs.

By integrating with WordPress, WooCommerce benefits from the flexibility and multitude of themes and plugins available for WordPress. This makes it attractive to many businesses and individuals looking to create a user-friendly yet powerful online store.