olemus
populaarseim veebiserveri tarkvara (enam kui pooltel veebisaitidel), OSi-litsentsiga, eeskätt UNIXipõhistele operatsioonisüsteemidele
= a widely used open source web server software suite

ülevaateid
https://en.wikipedia.org/wiki/Apache_HTTP_Server
https://www.digitalocean.com/community/tutorials/how-to-configure-the-apache-web-server-on-an-ubuntu-or-debian-vps
https://sites.duke.edu/workblog/files/2014/12/www.dedoimedo.com-apache-web-server-lm.pdf

veebisait
http://www.apache.org/

turvalisus
https://www.cvedetails.com/vulnerability-list/vendor_id-45/product_id-66/Apache-Http-Server.html
https://httpd.apache.org/security/vulnerabilities_24.html
https://www.petefreitag.com/item/505.cfm
https://www.acunetix.com/blog/articles/10-tips-secure-apache-installation/
https://www.feistyduck.com/library/apache-security/online/apachesc-CHP-1.html
https://www.apachecon.eu/
https://www.wp-bridge.com/blog/the-14-step-apache-security-best-practices-checklist/

vt ka
- Apache Hadoop
- Apache Subversion