BI is a concepts like DBMS. You can see the explanation of BI below form Wikipedia.
For DBMS we have many database like SQL server, oracle, mysql, MS access etc. All uses different techniques to handle data, but follows all DBMS concepts.
Like Qlikview, cognos, informatica, Crystal reports, Abinitio etc. are all BI reporting tools. Every tool has different features but follows the BI concepts.
Business intelligence (BI) mainly refers to computer-based techniques used in identifying, extracting,[clarification needed] and analyzing business data, such as sales revenue by products and/or departments, or by associated costs and incomes.
BI technologies provide historical, current and predictive views of business operations. Common functions of business intelligence technologies are reporting, online analytical processing, analytics, data mining, process mining, complex event processing, business performance management, benchmarking, text mining and predictive analytics.
Business intelligence aims to support better business decision-making. Thus a BI system can be called a decision support system (DSS). Though the term business intelligence is sometimes used as a synonym for competitive intelligence, because they both support decision making, BI uses technologies, processes, and applications to analyze mostly internal, structured data and business processes while competitive intelligence gathers, analyzes and disseminates information with a topical focus on company competitors. Business intelligence understood broadly can include the subset of competitive intelligence
Since Qlikview is one of the BI reporting tool. You can introduce yourself as Qlikview Developer. Generally Qlikview developer has the following roles
Hope this helps you.