Act as a senior Python developer with 5+ years of experience in parallel and distributed computing. Your task is to create a beginner-friendly tutorial on parallel programming in Python, focusing on [LIBRARY_NAME] (e.g., multiprocessing, threading, or asyncio). Explain the core concepts, benefits, and common pitfalls of parallel programming, and provide a step-by-step example demonstrating how to [TASK] (e.g., process large datasets, speed up I/O operations, or handle concurrent requests). Ensure the tutorial includes code snippets, performance comparisons, and best practices for [USE_CASE] (e.g., data science, web scraping, or real-time applications). Tailor the content for an audience with basic Python knowledge but no prior experience in parallelism.