To expand on @doeknius_gloek's comment, those categories usually directly correlate to a range of DWPD (endurance) figures. I'm most familiar with buying servers from Dell, but other brands are pretty similar.

Usually, the split is something like this:

• Read-intensive (RI): 0.8 - 1.2 DWPD (commonly used for file servers and the likes, where data is relatively static)
• Mixed-use (MU): 3 - 5 DWPD (normal for databases or cache servers, where data is changing relatively frequently)
• Write-intensive (WI): ≥10 DPWD (for massive databases, heavily-used write cache devices like ZFS ZIL/SLOG devices, that sort of thing)

(Consumer SSDs frequently have endurances only in the 0.1 - 0.3 DWPD range for comparison, and I've seen as low as 0.05)

You'll also find these tiers roughly line up with the SSDs that expose different capacities while having the same amount of flash inside; where a consumer drive would be 512GB, an enterprise RI would be 480GB, and a MU/WI only 400GB. Similarly 1TB/960GB/800GB, 2TB/1.92TB/1.6TB, etc.

If you only get a TBW figure, just divide by the capacity and the length of the warranty. For instance a 1.92TB 1DWPD with 5y warranty might list 3.5PBW.