PPP(A set of industry-standard framing and authentication protocols that are included with Windows to ensure interoperability with other remote access software. PPP negotiates configuration parameters for multiple layers of the Open Systems Interconnection (OSI) model. The Internet standard for serial communications, PPP defines how data packets are exchanged with other Internet-based systems using a modem connection. PPP is documented in RFC 1661)
DPI(The standard used to measure screen and printer resolution, expressed as the number of dots that a device can display or print per linear inch. The greater the number of dots per inch, the better the resolution)
