Many times we need to share or send big files to our friends, nowadays you has lots of option and web services which allows you to send big files over the internet, some of them are costly, some are free but privacy risk is there.
Still in this modern age I prefer to send files via email, it much faster and simple with safer too, but one problem which you might face on email is that there is file size limit, some of them allows you to send 10 MB file or maximum of 25 MB.
There are some more options available like put Timestamp, Encrypt, Zipped, delete source file, email after splitting and so on.
If wanna join file then click on Join tab and select both input and output folders, you can go through some of options like delete split part after joining, keep timestamps and so on.
You can perform split and join action right from your context menu too, just right click on any file or folder and you will see option.