what is aptitude?

I am trying to install pifacecad on a RPi1 with Rasbian Buster Lite.

Following the of this main page there seems to be an error...
```
$ sudo aptitude install liblircclient-dev cython gcc python{,3}-setuptools python{,3}-dev
```
This doesn't work, should this be 
```
$ sudo apt-get install liblircclient-dev cython gcc python{,3}-setuptools python{,3}-dev
```
