Development 86 Certification 82 Examinations 81 Application software 79 Electronic data processing personnel 71 Computer networks 68 Cloud computing 48 Java (Computer program language) 41 Security measures 31 Linux 30 Management 27 Operating systems (Computers) 25 Python (Computer program language) 24 Computer security 21 Web site development 21 Computer software 19 Client/server computing 18 Database management 18 Amazon Web Services (Firm) 17 Design 17 JavaScript (Computer program language) 16 Machine learning 16 Application program interfaces (Computer software) 15 Information technology 14 Web applications 13 Android (Electronic resource) 12 Web services 12 Web sites 12 Oracle (Computer file) 11 Programming 11