Portable Network Graphics. Portable Network Graphics (PNG /ËpÉªÅ/) is a raster graphics file format that supports lossless data compression. PNG was created as an improved, non-patented replacement for Graphics Interchange Format (GIF), and is the most widely used lossless image compression format on the Internet.
The slavery in the United States was a paradox because it contradicted the American ideal of freedom C. Slavery is one the black chapters in mankind history. It shows barbarian, immorality and misunderstanding.
The puzzle of slavery. People often think that slavery was always good for the slave owners in that it provided them with a pool of cheap labour. While this was sometimes true, slavery also brought a number of problems for canny business-people: 1  Capital is required up-front to buy the slaves.he puzzle of slavery. People often think that slavery was always good for the slave owners in that it provided them with a pool of cheap labour. While this was sometimes true, slavery also brought a number of problems for canny business-people: 1  Capital is required up-front to buy the slaves.