AI applications are increasingly evolving into more autonomous, long-running agents capable of handling complex tasks independently, a shift noted by LangChain in their observation of AI's progression from simple RAG (retrieval-augmented generation) to more sophisticated research and coding agents. This guide explores five popular types of AI agents, including software engineering, voice and phone call, general-purpose research, data analysis, and computer use and UI navigation agents, highlighting their unique capabilities and use cases. For example, Google Jules and Cline are transforming software development by autonomously managing coding tasks, while ElevenLabs and Hume.ai are advancing voice interactions with human-like speech and emotional intelligence. Platforms like n8n facilitate the creation of custom AI agents by integrating various capabilities into workflows tailored to specific business needs. This evolution underscores the importance of choosing the right AI tools, considering factors like integration capabilities, human oversight, and the balance between automation and manual intervention, as businesses look to leverage AI for enhanced efficiency and innovation in 2025.