NLP is a sub-branch of AI. Concepts from NLP are used in the following expert systems:

• Speech recognition system
• Question answering system
• Translation from one specific language to another specific language
• Text summarization
• Sentiment analysis
• Template-based chatbots
• Text classification
• Topic segmentation

We will learn about most of the NLP concepts that are used in the preceding applications in the further chapters.

Advanced applications include the following:

• Human robots who understand natural language commands and interact with humans in natural language.
• Building a universal machine translation system is the long-term goal in the NLP domain because you could easily build a machine translation system which can convert one specific language to another specific language, but that system may not help you to translate other languages. With the help of deep learning, we can develop a universal machine translation system and Google recently announced that they are very close to achieving this goal. We will build our own machine translation system using deep learning in Chapter 9, Deep Learning for NLP and NLG Problems.
• The NLP system, which generates the logical title for the given document is one of the advance applications. Also, with the help of deep learning, you can generate the title of document and perform summarization on top of that. This kind of application, you will see in Chapter 9, Deep Learning for NLP and NLG Problems.
• The NLP system, which generates text for specific topics or for an image is also considered an advanced NLP application.
• Advanced chatbots, which generate personalized text for humans and ignore mistakes in human writing is also a goal we are trying to achieve.
• There are many other NLP applications, which you can see in Figure 1.5: