Open Broadcaster Software (better known as OBS) is an open-source program that allows you to record and broadcast everything that happens on your PC screen, whether it's video games, browser windows, running programs, or the signal from your webcam. It is very flexible and versatile and compatible with the most famous streaming platforms like Twitch, Facebook, and YouTube.

What are the key features of OBS Studio?

Interface: First things first, it features a modern, modular, and compelling interface you can rearrange exactly the way you want and pop out every Dock to its own window. That's exactly what you want, no matter whether you are a beginner or a professional, as it lets you explore and work efficiently with all the individual tools.
Compose: You can achieve high-performance video and audio capturing and mixing in real time. Moreover, you can build scenes composed of multiple input sources, including images, window captures, texts, webcams, browser windows, and lots more. In a few words, you are the artist, and OBS Studio offers the flexibility you need to achieve whatever you want.

Scalability: Because there are no limits to what you may want to do, OBS Studio scales flawlessly and allows you to set up an unlimited number of scenes you can switch back and forth using custom transitions.
Audio mixing: You have total power over audio mixing thanks to the per-source filters, including noise gate, noise suppression, and gain. Oh, and one last thing, you can even extend the possibilities and take complete control thanks to VST plugin support.
Configurable: Thanks to the streamlined settings, you can access a wide array of configuration options and tune all aspects of your recording and broadcast. Moreover, you can use configuration options to add new sources and duplicate and adjust them very easily.

Handy shortcuts: You can configure shortcuts for almost all types of actions, such as switching scenes, starting or stopping transmission, muting audio, etc.
Advanced features: Professionals have specific needs, and OBS Studio understands that. That's why it features some advanced options such as Studio Mode, which allows you to preview your scenes and adjust them before broadcasting them live.
Record and share: You can record videos and save them to your hard drive, but you can also start live streaming to Twitch, Facebook Live, YouTube, and many more (even on your own server).

How to use OBS Studio?

Once installed and launched, you will see that most of its interface is occupied by a black window (which is the main scene preview). Select the audio and the image source, indicating whether it will be a screen capture, a window capture, a game capture, or other. For more information, you can also consult the official wiki page and the official quickstart guide.