A programming language is a set of symbols whose strings are governed by rules apt to communicate instructions to a particular machine. Such strings may be concatenated into longer code and implement ...

PDF files have become ubiquitous in our multi-platform world. This convenient file format makes it possible to view and share documents across various devices using various operating systems and ...

November 24, 2025 • Our annual reading guide returns with 380+ new titles handpicked by NPR staff and trusted critics. Find 13 years of recommendations all in one place — that's more than 4,000 great ...