As you can see the first process named top, with user as root; it's consuming ~65% of CPU. What is it for? The OS?
"As you can see"... No, I can't. The screenshot is unreadable.
Unrelated, plus you've already got answer, but what the hell is that color combination? That's the level of dark gray on black.
Do you happen to be colorblind? If not, how are you able to read the terminal screen?
Top is the process you are seeing the output of. By running "top" command, you spawn a process that will collect the data on all other processes.
It's like in Windows when you launch a Task Manager and Task Manager is at the top of your CPU usage because it's currently gathering all the data.
Does it mean that this process is the process of process monitoring application (android tool equivalent to windows' task manager) which is displayed in the screenshot. Thanks!
Yes. It's very likely only a simple terminal app that launches top. Top in termux (a more powerful Terminal) looks like this:
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