This document discusses open data and the benefits of making scientific data openly available. It begins by defining open data and listing open data licenses. The document then discusses how open data can advance science by allowing others to analyze data in new ways, improve reproducibility, and increase collaboration. Guidelines are provided for making data open, such as using data repositories and journals. The document also shares one researcher's experience developing an open-source tool called CellMissy to manage and exchange cell migration data between research groups in an effort to create an open ecosystem for sharing this type of scientific data.