Review of a particular feature of a certain programming language

Make a review of a particular feature of a certain programming language of your choice. Your review should contain a description, usage, and technical analysis of the feature. Elaborate on the implementation and design consideration of the chosen feature. Example review topics are listed below but you are NOT limited to only these.

- Pointers in C
- Lists in Python
- Abstraction in Java
- Type checking in swift
- Float implementation in C#

Your discussion of the feature should at least have the following outline
1 Title (Feature and Programming language)
2 Description
3 Design Considerations and Implementation
4 Usage and Example
5 Advantages/Disadvantages of the feature