An activity is any type of document you typically share with your clients, ranging from an intake form or a mental wellbeing assessment, to a homework exercise you have developed.
A pathway is a series of activities. You can determine the order in which these activities will be sent out, as well as the waiting time in between activities.
Some examples of pathways are a series of daily mindfulness quotes for 30 subsequent days or a character strengths at work pathway that assesses when clients are working from their strengths.
If you have your own online course, psycho-educational materials, or other micro-learning you wish to share with clients, setting up a pathway is the ideal way to drip feed this content to clients.