Electronic lab notebooks (ELNs) are tools that allow experimental protocols and data to be captured digitally; they are analogous to the more traditional paper and pen. In theory, they make it easier to capture, store and share experimental data. However, adoption has been slow in the academic sector. This book provides a description of how and why scientists record data, an overview of the current ELN technology available and the benefits and pitfalls of using them for those interested in implementing digital data solutions within their research groups or departments.