Chest pain is an umbrella term to describe any pain or discomfort in the chest area (image of chest area). It may feel dull or sharp, last a few seconds to a few hours, occur in one spot or spread across the width of the body and down the arms.
file name - (computer science) the name given to a computer file in order to distinguish it from other files; may contain an extension that indicates the type of file. computer file name, computer filename, filename.
File extensions and file formats are often spoken about interchangeably - I do it here on my site, too. In reality, however, the file extension is just whatever characters are after the period while the file format speaks to the way in which the data in the file is organized - in other words, what sort of file it is. For example, in the file name mydata.csv, the file extension is csv, indicating that this is a CSV file.