Whiteboarding is a technique that involves using a whiteboard or a similar tool to visually represent a process, problem, or solution. Whiteboarding helps the BA collaborate with multiple stakeholders by building a shared understanding of the current state, creating a space for everyone to contribute since the activity feels shared, and guiding the conversation while maintaining engagement. Whiteboarding also helps to identify issues, gaps, opportunities, and dependencies in the process, and to generate ideas and feedback from stakeholders.
References:
https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-process-mapping/plan-and-facilitate-