Collections refer to a way of organizing and managing groups of related content or data types. They offer a structured approach to handle content that shares common characteristics or needs to be grouped for easier management. 

Organizational Structure: Collections help in categorizing content by type, such as blog posts, products, events, or portfolios. This structure makes it easier to manage and retrieve content based on its type or category.

Custom Fields: Collections often come with custom fields or attributes specific to the type of content being managed. For example, a product collection might include fields for price, description, and image, while a blog post collection might have fields for author, publish date, and tags.

Templates: Collections can be linked to specific templates that define how the content is displayed on the website. This allows for consistent formatting and presentation of similar types of content.

Dynamic Content: By using collections, you can create dynamic pages that automatically pull in content based on the collection criteria. For instance, a blog page might dynamically list all posts from the blog collection.

Filtering and Sorting: Collections often provide built-in tools for filtering and sorting content, making it easier for administrators and users to find and manage information.

Content Relationships: Collections can be used to define relationships between different types of content. For example, a blog post collection might be related to a categories collection, allowing for easy linking and categorization.