Why does the go redis/v8 version function input must have a context type?

[MrGlp]

Why does the go redis/v8 version function input must have a context type?
example: go redis/v8
func (c cmdable) Set(ctx context.Context, key string, value interface{}, expiration time.Duration) *StatusCmd {...}

but go redis does not
example: go redis
func (c cmdable) Set(key string, value interface{}, expiration time.Duration) *StatusCmd {...}

What is the difference and impact on use?

[vmihailenco]

context.Context is mainly used for canceling operations and tracing. It is a general Go feature so you should be able to google more info if needed.