What exactly is cart abandonment and how is it different from browse abandonment?

I've been running my Shopify store for about two years now, and I keep hearing these terms thrown around in e-commerce forums – cart abandonment and browse abandonment. At first, I thought they were the same thing, but apparently they're not? I'm seeing a lot of visitors come to my store, some add products to their cart but never check out, while others just browse around and leave without adding anything. It's frustrating because I'm spending good money on Facebook ads to drive traffic, but I can't figure out which type of abandonment is hurting me more. My analytics show people are definitely interested – they're spending time on product pages, some are even adding items to their cart, but then... nothing. They just disappear. I need to understand the difference between these two types of abandonment so I can tackle the right problem. Is it that people aren't convinced by my products (browse abandonment), or are they getting cold feet at checkout (cart abandonment)? And more importantly, what can I actually do about each one? I feel like I'm leaving so much money on the table, and my ROAS is suffering because I'm not converting these visitors who are clearly showing some level of interest.