What is the best database for Python?

Hello, I would like to ask you to suggest databases to use in my project that I will do in python.
I wish to develop a python application similar to an online chat, in which I will send messages to a bank, so that it is possible for any user with an internet connection to receive them. I first thought about using ThingSpeak, but there is a delay in sending one data to another, which would lead to a bad experience in the application . Are there other databases that can offer such support?