In this episode of "Fundamentals," the focus is on Annual Recurring Revenue (ARR), a vital metric for SaaS businesses. The hosts start by comparing ARR to other financial metrics, then move on to explain how to calculate it, including differences between monthly and annual subscriptions. They emphasize the importance of ARR for benchmarking against competitors and attracting investors, making it clear that a solid grasp of this metric is crucial for SaaS success. The discussion also delves into the complexities of ARR calculations, addressing factors like discounts and currency fluctuations. To wrap up, the episode gives a sneak peek into the next installment, which will explore Customer Acquisition Cost (CAC) and Lifetime Value (LTV).