31. Which core module in Node.js is used to create web servers and handle HTTP requests and responses?
32. In Node.js, which core module is used for working with file systems, including reading and writing files?
33. Which core module provides functionality for working with paths and file directories in Node.js?
34. What is the primary purpose of the os core module in Node.js?
35. Which core module allows Node.js applications to perform network operations and create network servers or clients?
36. What does the util core module in Node.js provide?
37. In Node.js, which core module is used to parse URLs and construct URL objects?
38. What is the primary role of the crypto core module in Node.js?
39. Which core module is used for working with events and creating custom event emitters in Node.js?
40. What is the purpose of the child_process core module in Node.js?