LibreOffice is an Open Source Software.
A software is classified as Open Source when your code can be use, modified and distribute with its original rights.
For answering this question, you should know a software LibreOffice.
LibreOffice is a software that allows to create: sheets, documents, drawing, charting, database, presentations, etc. It's free and an open source software - main advantages when compared to other software available.
In the other words, LibreOffice is free because the user does not need to pay any license. Also, it is an open source software because your code can manipulate for any developer.
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