Data Interpretation is related to the understanding, organizing as well as interpretation of data to arrive at a meaningful answer. With a piece of information being provided, questions are required to be solved based on the data. 
In the case of bank exams, around 10-15 questions are asked in prelims and around 10 to 20 questions are asked in the mains examination. The list of exams includes SBI PO, IBPS PO, IBPS RRB, LIC AAO, SSC CGL, SBI Clerk, IBPS Clerk, IBPS SO etc. Good command over topics of numerical ability is important to solve these types of questions. 

Bar Charts

Pie Charts

Table Charts

Mixed Charts

Line Chart

Web Chart

Set Theory

Info chart

Data Interpretation can be one of the most time-consuming topics in the Quantitative Aptitude section of bank examinations. Some of the reasons why data interpretation is not among the favourites of students include the following:
Format of Data Interpretation Questions
The questions based on Data Interpretation can be asked in various formats. Some of the formats in which questions can be asked in prelims and mains include the following:
Solving questions based on DI 
The following factors should be taken into consideration while solving questions based on data interpretation. 
Write down the list of topics which are important to master questions related to DI. The topics include Averages, Percentages, Ratio and Proportion and Mixture & Allegation. 
Jot all the important formulas for each of the topics. 
Ratio = Comparing values in the form ‘p/q’ to find out their simplest terms
Averages = (Sum of Values) / (Total Number of Values)
Percentage = (Number/Total Numbers) * 100
Percentage Change = [(New Value – Old Value) / Old Value] * 100
Understand the requirements for each of the DI questions. It includes - linear graphs, bar graphs, pie graphs, tables and mixed graphs. 
Along with writing each kind of graph, note the example question to learn more about solving them. 
Read and understand the question carefully, learn to understand what the graph suggests. 
Understand the time required to solve such questions and learn to avoid such questions if they are too time-consuming.
Sample Questions 
1) Quiz 30, Q1
2) Quiz 60, Q1