WSJ Buy Side is The Wall Street Journal’s research and commerce team. Our commerce content is distinct from our newsroom coverage. We earn a commission from some links in our articles. Learn more. Oct ...

Charnita is a wife, pet mom, tech enthusiast, and part-time freelance writer with over 14 years of experience. She's done countless app roundups, product reviews, and tutorials! In her free time, she ...

Xvid is rarely used these days, but that means it can be hard to know what to do with it if you come across it while digging through your old files. It’s essentially a method for compressing video, ...

On computers and mobile devices, file extensions are the suffixes that apps append to filenames. When you see an item like "document.docx" for example, the .docx extension tells the computer and the ...

I can't quite figure it out. Personally, I would be lost without file extensions. How do you know what program to open files up in? How do you tell the difference between pictures and text files?