How to Run and Customize LLMs Locally with Ollama

Ollama is a free, open-source tool that simplifies running Large Language Models like Meta's Llama 3.3 or Google's Gemma 3 directly on personal computers through a process called quantization that compresses models for consumer hardware. Users can download, customize, and run these AI models offline using simple terminal commands, maintaining complete data privacy while avoiding subscription costs and enabling personalized AI assistants through Modelfiles configuration.