Since its first beta release in April of 1993, the Slackware Linux Project has aimed at producing the most "UNIX-like" Linux distribution out there. Slackware complies with the published Linux standards, such as the Linux File System Standard. We have always considered simplicity and stability paramount, and as a result Slackware has become one of the most popular, stable, and friendly distributions available.
Ranked in these QuestionsQuestion Ranking
Uses stable, plain-vanilla packages from upstream.
Pro Ideal to learn more of Linux
Pro Package management
Uses standard tar archives with shell scripting as packages.
Pro One more distro which is init based
Some users don't like to install systemd based distros because they increase booting and processing speed.
Pro Most oldest linux distro
Slackware project was started in 1992. It is only one of the old distros which is still active.
Con Large size live ISO
One need to vain 3GB+ data for downloading one slackware ISO.