Transaction means to exchange something.
A 'transaction' file is used to allow batch processing of data.
For example a 'stock control transaction file' would have a record of stock changes that may have happened over a day. The transaction file is then processed in one go (maybe over night) by a database so that the stock database is kept up to date.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Transaction File