Termux is terminal emulator for Android, where users can perform a range of Linux functions. From managing files to running programs to accessing servers, Termux will let users do most of the things they does with the command-line prompt in PCs. Termux is capable of drawing hundreds of Linux packages, which can be used for various purposes. Termux can be used for running NodeJS, Ruby, or Python, and can be accessed via any external keyboard if connected.
Accessing a device (phone or a PC) that's having a proper interface is easy, but often slow if you're not having the high-end hardware. Thus, most software geeks, developers in fact use command-line prompt for managing applications in their device. Apart from just handling the apps, they can also manage any connected devices remotely.
Thus, advantages of using terminal (or a command-line prompt) are endless. But, what's good if it is only limited to PCs, which is hard to carry everywhere. And that's why the Fredrick Fornwall Inc thought and made a similar terminal for Android devices - Termux.
Termux is free and open-source terminal with similar abilities of a command-line prompt, which can be used for accessing files, managing them and handling devices. Termux emulation has access to Linux package collection, which is extensive and helpful if leveraged.
Once installed, Termux downloads a small base file, which is essential for its configuration. And when done, you will be presented with the terminal just as you see in your PC. You can use your device's inbuilt keyboard to type in commands, and also other functions like ESC, CTRL, ALT and the character cursor is being provided. These special keys help in entering the commands which need combinations.
And with all set, here are the things you can do with Termux on Android:
Termux can be accessed by an external keyboard too, by connecting it to the device. Also, there's an inbuilt Help option available for learning Termux, if you stumble anywhere. Long press on anywhere on the terminal to check the Help menu.