Data Science, with a particular focus on Hadoop and R, is a highly sought-after technical skill in today's data-driven business environment. It combines aspects of statistical analysis, big data technology, and programming to extract valuable insights from vast amounts of complex data.

Data Science using Hadoop platform involves the storage, organization, and analysis of Big Data. Hadoop, as an open-source software platform, can process large data sets across clusters of computers using simple programming models. It is designed to scale up from a single server to thousands of machines, each providing local computation and storage. This means that companies looking for this skill set often require understanding and handling very large and complex data systems.

On the other hand, R is a programming language and free software environment specifically used for statistical computing and graphics. This implies that basic programming skills, especially in the R language, are a must for data manipulation, statistical analysis, exploratory data analysis, and visualization.

To be proficient in Data Science using Hadoop and R, one should understand how to use Hadoop's distributed computing system for big data problems and R for data management and analytics. Proficiency in statistical and mathematical concepts, as well as intermediate-level programming skills, is necessary for this role. A basic understanding of databases, SQL (Structured Query Language), and familiarity with machine learning algorithms will also enhance one's knowledge in this field.

By learning and mastering this skill, candidates can apply for a wide range of job roles such as Data Scientist, Data Analyst, Big Data Engineer, or Data Architect. These roles help organizations leverage information to make strategic decisions, offering huge potentials for career growth.

To build a solid foundation for this skill, one can start by getting familiar with SQL and R programming, along with basic concepts in statistics and databases. With persistent learning and practice, candidates would certainly gain the competency required to navigate the fascinating world of data science with Hadoop and R.