Difference between StrContent or BinContent in t_document table?

[ea0522]

The t_document table contains two columns "StrContent" and "BinContent".
In some rows, e.g. when the table contains information on diagram images, both columns contain information.

Can someone elaborate on the difference between both columns?
Do they contain the same information in different formats?

[qwerty]

Looking in my book it tells "The string value for certain DocTypes"  for StrContent
I guess you won't get more info than that.

q.