What is Data Science?
Data science is the field of study that combines domain expertise, programming skills, and knowledge of mathematics and statistics to extract meaningful insights from data. Data science practitioners apply machine learning algorithms to numbers, text, images, video, audio, and more to produce artificial intelligence (AI) systems to perform tasks that ordinarily require human intelligence. In turn, these systems generate insights which analysts and business users can translate into tangible business value.
Why Data Science is Important?
More and more companies are coming to realize the importance of data science, AI, and machine learning. Regardless of industry or size, organizations that wish to remain competitive in the age of big data need to efficiently develop and implement data science capabilities or risk being left behind.

Data base management
SQL, Data Warehouse, Data Lake, structured and unstructured data

Data Analytics
Examination of existing databases in order to extract new information

Business Intelligence
Business Analysis and Visualization in Power Bi, DAX, Advanced Excel, Power Query, Power Pivot

Statistics
Statistical models, mathematics and calculus for data analysis and Data Science

Big Data
Structuring, modeling, and manipulating large amounts of data