### Q1: What is the primary purpose of an API in software development?  
### Q2: How do APIs facilitate communication between different software systems?  
### Q3: What are the differences between RESTful APIs and SOAP APIs regarding their communication methods?  
### Q4: Can you provide an example of how an API simplifies the user experience when logging into a website?  
### Q5: In what ways do APIs enhance the scalability of applications in a B2C context?  
### Q6: How can APIs help streamline an e-commerce business process during online transactions?  
### Q7: Why is it essential for developers to understand APIs when working on back-end development?  
### Q8: How can the integration of payment gateway APIs increase user trust in online shopping?  
### Q9: What communication strategies can developers use to effectively explain the importance of APIs to non-technical stakeholders?