What is Solana crypto?

Could you please elaborate on the nature and characteristics of Solana cryptocurrency? I've heard it mentioned but am not entirely familiar with its workings. Specifically, I'm curious about its underlying technology, its potential applications, and how it differs from other cryptocurrencies in the market. Additionally, I'd like to know about its scalability, transaction speed, and any potential risks or challenges associated with investing in Solana. Could you provide a concise yet comprehensive overview of Solana and its position in the cryptocurrency landscape?