When designing a logo, you need to take into consideration the fact that each colour gives a different impression, even if you’re not intending it to. Colours convey a meaning, and logo design needs to take this into consideration.
Blue is the most popular colour to use in a logo, as it seems to show calm and professionalism. It’s also linked with success, hence loads of banks and government bodies have blue in their logo.
Green unsurprisingly is used when emphasising natural, ethical, health in a logo. You will also see it in financial products too, as it shows growth and success.
Red shows energy, danger, passion, warmth etc, hence you’ll see it in a lot of food products. Food chains such as Pizza Hut, McDonalds, Dominos all have red in their logo.