Small Language Models (SLMs) are compact versions of traditional language models designed for efficient operation on resource-constrained devices like smartphones and low-power computers. Unlike large language models with billions of parameters, SLMs range from 1 million to 10 billion parameters, offering core natural language processing capabilities such as text generation, summarization, and translation. Techniques like knowledge distillation, pruning, and quantization are employed to reduce their size without significantly compromising performance. These models have low compute requirements, reduced energy consumption, and can run offline, making them ideal for real-time applications on mobile and desktop devices. Despite their benefits, SLMs have limitations, including narrower scope and potential bias due to smaller datasets. They are versatile, supporting applications in chatbots, code generation, language translation, and more. Tools like PocketPal and Ollama facilitate the deployment of SLMs on mobile and PC platforms, respectively, while fine-tuning options allow customization for specific domains. SLMs are transforming AI accessibility by providing powerful solutions without the computational demands of larger models.