MagSafe-certified and MagSafe-compatible refer to different levels of compatibility and functionality with Apple’s MagSafe technology. MagSafe-certified products are officially licensed and certified by Apple through its "Made for MagSafe" program. These products are guaranteed to work seamlessly with MagSafe features, including precise magnetic alignment and faster wireless charging speeds, up to 15W for iPhone 12 and later models. The certification ensures that the products meet Apple's high standards for safety, performance, and compatibility, delivering a full MagSafe experience.

On the other hand, MagSafe-compatible products may not have undergone Apple’s certification process but are designed to work with MagSafe technology. While these products may include magnets for alignment, they often do not offer the same level of functionality as certified products, particularly in terms of charging speed, which is typically capped at 7.5W, similar to standard Qi wireless chargers. Additionally, because they lack official certification, MagSafe-compatible products might not deliver the same level of precision, reliability, or safety as their certified counterparts.

While a MagSafe-compatible case can enhance the charging experience by providing additional alignment and stability, it is not required to use a MagSafe charger. The charger can still function with compatible devices even without a MagSafe case. MagSafe-compatible cases under 3mm are best. 

MagSafe charging is a technology developed by Apple that utilizes magnets to securely attach a charging puck or pad to compatible devices, such as iPhones or AirPods. It enables wireless charging without the need for a physical connection, providing convenience and ease of use.