Please give me  the potential implications of overfitting described in the following text

The potential implications of overfitting are:
- poor performance of the validation set.
- a function that is overfitted is likely to request more information about each item in the validation dataset.
- A overfitted function is likely to be less portable than a simple one.
- it may be possible to reconstruct details of individual training instances from an overfitted machine learning model's  training set.