0down vote favorite is this correct? i want to say that those things seemed impossible a long time ago but later happened. 1 - i (have -add it or no? ) never thought i would have ended up writing this letter. 2 - i have never imagined that i would have wanted anything like this.

Batch Processing is the processing of previously collected jobs in a single batch.

Explanation:

Some advantages would be that a data center's staff can schedule batch processing during times when the computers are otherwise idle, such as overnight, The computer operators can delay or prioritize different batches easily, and computer files containing commands, programs and data; once created, some can be run repeatedly as needed, adding convenience for the staff and helping keep processing costs low.

Some disadvantages would be that all of a batch job's input data must be ready before the computer can run it, problems with data, errors and program crashes that occur during batch jobs bring the whole process to a halt, and the inputs must be carefully checked before the job can be run again.

https://www.techwalla.com/articles/advantages-disadvantages-of-batch-processing