In its early days, Perplexity relied heavily on third-party resources, particularly 
Bing and 
OpenAI's models. However, as it evolved, it began investing in its in-house crawler to optimize its index and ranking capabilities. This evolution enables Perplexity to serve 
tailored answers while addressing user queries effectively, whether the questions pertain to specific data studies or broader informational searches. This adaptability is crucial since 
Aravind Srinivas, CEO of Perplexity, pointed out that users often seek comprehensive, high-quality content, not just surface-level responses.