Task types are a custom task attribute that allows you to categorize tasks in a meaningful manner. There are a few Default Task Types available in Orangescrum with the freedom for you to define your own task types that are relevant to your projects and team. When you set a Default Task Type during project creation, all tasks that you create in that project will have your pre-defined Task Type as set here.
For e.g. if you set the Default Task Type as Enhancement then all tasks created under the project will by default have the task type value as Enhancement.