I heard this term a few times while taking an online course, HDE 100 – Apache Hadoop Essentials. I took the course in order to acquire at least a beginner’s understanding of what Hadoop and MapR are. Hadoop is a system that processed big data, while MapReduce is like the algorithm used in processing.
Here is the first sentence from Wikipedia on Sentiment Analysis:
Sentiment analysis (also known as opinion mining) refers to the use of natural language processing, text analysis and computational linguistics to identify and extract subjective information in source materials. Sentiment analysis is widely applied to reviews and social media for a variety of applications, ranging from marketing to customer service.
The overall goal of sentiment analysis is to find the “sentiment” of the user/customer’s opinions and thoughts. Here is an article about Sentiment Analysis in action.