I'm guessing that you're using Circuit Python. I moved this question to the Arduino forum, although it's possible that you're using a Raspberry Pi. I just happen to use the DHT units on Arduinos - although in Arduino's C++ like language, not Python.
The round() function takes a numeric value (humidity) and rounds it to a specified number of decimal places. And actually, that code is defective, because it's treating temperature and humidity as the same thing. In this case, since you passed the value 2 to ReadTemperature, it rounds the humidity (!!!) to 2 decimals, then returns it as a "temperature".
The proper code should be like this:
I don't know what generally-accepted name formation rules are for Python, but I always use either C-like (read_temperature) or Java-like (readTemperature). Beginning a name with a capital letter is usually something only done for classnames and constant names (which are generally all upper-case).
And the code tags goe around the formatted text. That's why my code is in a box, but yours has an empty box and no pretty code. Check Use Code Tags for details.
Some people, when well-known sources tell them that fire will burn them, don't put their hands in the fire.
Some people, being skeptical, will put their hands in the fire, get burned, and learn not to put their hands in the fire.
And some people, believing that they know better than well-known sources, will claim it's a lie, put their hands in the fire, and continue to scream it's a lie even as their hands burn down to charred stumps.