### Q1: What is the main purpose of a server in back-end development?  
### Q2: How does an application process a client request and interact with the database?  
### Q3: What factors can lead to a failure in the application logic when retrieving data from the database?  
### Q4: In what ways can the choice of a database affect the performance of a web application?  
### Q5: How can understanding the interaction between servers, applications, and databases help in optimizing a web application's scalability?  
### Q6: What strategies can developers implement to ensure robust communication between the application and the database?  
### Q7: Why is it important for developers to effectively communicate the functionality of a web application to team members?  
### Q8: How can clear communication of application requirements prevent issues during the development process?  
### Q9: What role does effective communication play in troubleshooting issues that arise between the server, application, and database?