Google Slides along with its other complementary Google docs and sheets is a great and very simple presentation builder. You can choose from tens of available templates or create your own.
Fonts, Styles, and Colors are carefully selected to give your presentation a professional look. The best thing about the product is you can collaborate in teams while editing and building your presentations. All the work can be done very easily in real time.
Google Slide is a free tool for an individual user. However, you can buy a google business suit and it comes with better features for a team and organizational use.