GA4 - Channel Source Grouping is a feature in Google Analytics 4 that allows you to organize your traffic sources into custom channel groups. With this feature, you can categorize your marketing channels based on specific criteria and view aggregated data for each channel group. This helps you gain insights into which marketing channels are driving the most traffic and conversions on your website or app. By grouping your channels, you can effectively analyze the performance of your marketing campaigns, allocate resources, and make data-driven decisions to optimize your marketing strategy. Channel Source Grouping provides a flexible and powerful way to organize and analyze your marketing data in Google Analytics 4, empowering you to better understand the impact of your marketing efforts.