I am a computer science student working on a school project involving RTL-SDR receivers, and I have a hard time grasping the concept of IQ data. Basically what I think I have learned from all of the videos I watched on the topic is that the I signal is the captured signal multiplied by some sine wave, while the Q signal is also the captured signal multiplied by cosine wave, thus making the signals 90 degrees out of phase from each other, and helping us determine if the captured signal was above or below our center frequency.
Now, this is where I get confused, because shouldn't that mean that I and Q signals are basically identical, just out of phase? I tried looking that up, and almost everywhere I looked people say that the signals are not the same and are completely different. Any help would be appreciated!