Explore the world of NoSQL databases and learn when to consider them over traditional relational databases in this conference talk from NDC Sydney 2020. Gain insights into the differences between NoSQL and relational databases, understand the CAP theorem, and discover the ACID vs BASE properties. Learn about consistency models and follow a three-step guide to determine if NoSQL is right for your project. Examine the four key characteristics of data - volume, velocity, variety, and valence - to make informed decisions about database selection. By the end of this talk, acquire the knowledge to confidently choose between relational and NoSQL databases for your modern application needs.