var vs :=

Go provides two main ways to declare variables: using var and using the short declaration operator :=.

The var keyword is used for explicit variable declarations. You can use it to define a variable with or without assigning a value. If no value is provided, Go assigns a default zero value based on the variable type. var can be used both inside and outside functions.

The := syntax is a shorthand for declaring and initializing a variable. It infers the type from the value and can only be used inside functions. This is a quick and convenient way to create variables without explicitly mentioning their types.