Similar to Docs, this is an online spreadsheet where users can create, collaborate and edit spread sheet with other people. Excel sheets can be imported and converted to spreadsheets. Calculations, formula editing etc can be done for the data. Charts can also be created for data and editing can be done by the shared users. This spreadsheet can even be embedded on your website or blog.
Write, edit, review and collaborate is what Google Docs entails. You can edit documents on the go with smart formatting and editing tools.
Google slides is an online presentation app that allows you to show off your work in a visual way. With Google slides you can create and edit presentations and share with their groups, colleagues and team.
Forms can be created effortlessly using Google Forms. You can easily conduct a survey, collect details like contact numbers & address, conduct a quick poll, plan and raise opinions on an event etc using these forms.