What is the difference between prtg and MRTG?

Could you please elaborate on the key differences between PRTG and MRTG? Are they both tools used for network monitoring, and if so, how do they differ in terms of their features, capabilities, and the types of networks they are best suited for? Additionally, are there any specific use cases or industries where one might be preferred over the other? Understanding these nuances would greatly assist in selecting the most appropriate tool for a given scenario.