What Are Agile Spikes? When and Why Do Teams Use Spikes?
Briefly

Most work in sprints focuses on building new features, but Scrum teams should also allocate time for getting smarter through spikes for better decision-making and product delivery.
Spikes in agile projects are time-boxed research activities aimed at building knowledge rather than delivering immediate new capabilities, adapted from Extreme Programming to aid in making informed decisions about user stories.
Read at Mountain Goat Software
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