Nhập mật khẩu Wi-Fi để kết nối.

Vietnamese often leaves out the subject when it is obvious from context. In a phone, computer, or app instruction, Nhập mật khẩu Wi‑Fi để kết nối naturally means Enter the Wi‑Fi password to connect or Enter your Wi‑Fi password to connect.

This is very common in commands and interface text. Vietnamese is often more concise than English in this way.

Nhập means to enter / type in / input in this context.

It is commonly used for entering information into a device or form, such as:

• nhập tên = enter a name
• nhập mã = enter a code
• nhập mật khẩu = enter a password

So here, Nhập is an instruction: Enter.

Mật khẩu is the standard Vietnamese word for password.

It is made up of:

• mật = secret
• khẩu = word / spoken phrase

Together, it literally suggests something like a secret word, which matches the idea of a password.

Vietnamese noun phrases usually put the main noun first and then the describing word or phrase after it.

So:

• mật khẩu Wi‑Fi = password Wi‑Fi = Wi‑Fi password
• mạng Wi‑Fi = network Wi‑Fi = Wi‑Fi network
• ứng dụng học tiếng Việt = application learn Vietnamese = Vietnamese-learning app

This is a very normal Vietnamese pattern:

• head noun
  • specifier/descriptor

Here, để means in order to or so that.

It links the action and its purpose:

• Nhập mật khẩu Wi‑Fi = enter the Wi‑Fi password
• để kết nối = in order to connect

So the structure is:

Verb/action + để + purpose

Examples:

• Học chăm chỉ để thi đỗ. = Study hard to pass the exam.
• Mở ứng dụng để xem bản đồ. = Open the app to see the map.

Kết nối means to connect.

In technology contexts, it is used for connecting to:

• Wi‑Fi
• the internet
• a device
• Bluetooth
• a network

Examples:

• kết nối Wi‑Fi = connect to Wi‑Fi
• đã kết nối = connected
• mất kết nối = lost connection / disconnected

In your sentence, để kết nối means to connect.

In this sentence, kết nối functions as a verb: to connect.

However, Vietnamese words can often work in more than one grammatical role depending on context. For example:

• Điện thoại đang kết nối. = The phone is connecting / connected.
• Kết nối không ổn định. = The connection is unstable.

So Vietnamese is often less rigid than English about word classes.

It is neutral and standard for an instruction on a device or interface.

Vietnamese uses short imperative-style phrases in menus, apps, and system messages, just like English does:

• Nhập mật khẩu
• Chọn ngôn ngữ
• Bấm tiếp tục

It is not rude. It is simply the normal style for instructions.

Usually, để should stay here because it clearly shows purpose.

• Nhập mật khẩu Wi‑Fi để kết nối. = Enter the Wi‑Fi password to connect.

If you remove để, the sentence becomes less natural and less clear:

• Nhập mật khẩu Wi‑Fi kết nối. → this sounds wrong or confusing

So in this sentence, để is important.

Yes. That would also be natural.

• kết nối = connect
• kết nối mạng = connect to the network / get online

The shorter version, để kết nối, is common when the context already makes it clear that it means connecting to Wi‑Fi or the network.

Because Wi‑Fi is normally used as-is in Vietnamese. Many technology terms are borrowed directly or kept in their international form.

So Vietnamese speakers commonly say:

• Wi‑Fi
• Bluetooth
• email
• app or ứng dụng, depending on context

Thus, mật khẩu Wi‑Fi is completely normal Vietnamese.

It specifically means the Wi‑Fi password because Wi‑Fi directly modifies mật khẩu.

Compare:

• Nhập mật khẩu. = Enter the password.
• Nhập mật khẩu Wi‑Fi. = Enter the Wi‑Fi password.
• Nhập mật khẩu tài khoản. = Enter the account password.

So the added noun after mật khẩu tells you what kind of password it is.

The pattern is:

Verb + object + để + verb

In this sentence:

• Nhập = enter
• mật khẩu Wi‑Fi = Wi‑Fi password
• để = in order to
• kết nối = connect

So the structure is:

Enter + the Wi‑Fi password + in order to + connect

This is a very useful pattern in Vietnamese for expressing purpose.