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A variable is a named storage location in memory that can hold a value that may change.

Store data such as inputs, configuration, and computed results.

var age int = 18
name := "Phong" // short declaration
const Pi = 3.14 // constant
 
_ = age
_ = name
_ = Pi

• `:=` can only be used inside functions.
• Go has zero values: if you don't assign, the variable gets a default value.

• variable /ˈveriəbəl/: biến
• storage /ˈstɔːrɪdʒ/: lưu trữ
• memory /ˈmeməri/: bộ nhớ
• short declaration /ʃɔːrt ˌdekləˈreɪʃən/: khai báo rút gọn
• zero value /ˈzɪroʊ ˈvæljuː/: giá trị mặc định