Office suites are software programs which allow you to craft documents. They usually combine multiple software products. Examples for office suites are:
LibreOffice
Calligra
SoftMaker Office
Microsoft Office
Types of software
word processing – e.g. LibreOffice Writer, Microsoft Word
calculation – e.g. LibreOffice Calc, Microsoft Excel
layouting – e.g. Microsoft Publisher
presentations – e.g. LibreOffice Impress, Microsoft PowerPoint