Welcome to the ODK forum, @javedak09! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!
Central is the ODK server and the only supported method of getting data out of Collect. Pulling data directly from Collect was no longer a widely-used feature, and it was becoming more challenging to maintain due to changes to Google's app policies. Briefcase was the method of pulling data directly from Collect and Briefcase is no longer being updated since April 2022. Note also that Aggregate is no longer being updated since May 2021.