Form wikipedia we can discover a brief explanation about the technical debt:
Technical debt (also known as design debt or code debt) is “a concept in programming that reflects the extra development work that arises when code that is easy to implement in the short run is used instead of applying the best overall solution”.
Technical debt can be compared to monetary debt. If technical debt is not repaid, it can accumulate ‘interest’, making it harder to implement changes later on. Unaddressed technical debt increases software entropy. Technical debt is not necessarily a bad thing, and sometimes (e.g., as a proof-of-concept) technical debt is required to move projects forward. On the other hand, some experts claim that the “technical debt” metaphor tends to minimize the impact, which results in insufficient prioritization of the necessary work to correct it.