Technical debt in Agile is the cost of maintaining and updating code over time. Technical debt refers to the trade-off that is made when shortcuts are taken during the development process in order to meet a deadline or budget constraint. These shortcuts result in code that is more difficult to maintain and update in the future, which increases the cost of maintaining and updating the codebase over time. Technical debt is an important concept in Agile, as it helps teams to understand the long-term consequences of their short-term decisions.