Feature classes are a way of defining features (points, lines, polygons) that share attribute fields and a style. Feature classes help you standardize your data collection. The attribute fields included in a feature class are sometimes referred to as forms. Feature classes are housed inside of Feature Class Datasets.
A feature class dataset is a group of feature classes and can include point, line, and polygon types. Feature class datasets allow you to group realted feature classes for field use.
You can share and import individual feature classes as well as entire feature class datasets. This is useful when collaborating in the field, as well as backing up custom created feature classes. To find the export and import options simply navigate to the dataset or class you want to import/export in the Options panel. From there, you'll see the option at the bottom of the details view.