Companies are a vital part of your country. All the available working force must be occupied with jobs to keep your economy running, otherwise you won't get any tax return and your economy will head south.
There are many kinds of companies, ranging from technological, public, etc.
You can found only one kind of company; Public companies, or State owned companies, where you get all the profit. There's also private companies, that are randomly generated. You can set the auto-found rate for private company: 0 to 100%