The keyword 'this' is used a lot in object coding.
When coding an instance method, we are actually writing code that applies to an object instance that will exist at runtime.
More details:
We could also think of the object 'this' as 'self', 'me', 'myself', 'currentObject', ... The keywords 'this' and 'self' are probably the most commonly used (in programming languages).
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Coding Fundamentals
(Chapter 951 - Glossary)