What is a VPN?
VPN, short for Virtual Private Network, creates an encrypted tunnel between a device or network and a VPN gateway over a public network. Internet services generally see the gateway's IP address , while the VPN provider can still be in a position to observe connection metadata. A VPN protects traffic on the path to the gateway; it is not the same as application-level anonymity.
Why use a VPN?
In today's digital age, network security and privacy protection have become increasingly important. There are several reasons to use a VPN:
- Privacy Protection: VPN can effectively hide the user's real IP address, avoid being tracked and monitored, and enhance personal privacy protection.
- Secure Encryption: VPN encrypts data, which can effectively prevent hackers from stealing sensitive information even in public Wi-Fi networks.
- Bypassing Geographical Restrictions: Some content or services may be restricted in specific regions. Through VPN, users can easily access resources worldwide.
- Anonymous Browsing: After using a VPN, users' online activities are more anonymous, allowing them to browse the Internet more freely without being tracked.
How does a VPN work?
The working principle of VPN involves the following key steps:
- Establishing a Connection: The user's device establishes a connection with the VPN server through the VPN client.
- Tunnel Establishment: An encrypted tunnel is established between the VPN server and the user's device, and all traffic passing through this tunnel is encrypted.
- Data Transmission: The user's network traffic is transmitted to the VPN server through the encrypted tunnel and then forwarded to the target network.
- Accessing the Network: The target network sends response data back to the VPN server, which then transmits the encrypted response data back to the user's device.
What benefits can a VPN bring?
Using a VPN can bring users benefits in various aspects:
- Enhanced Security: Whether it is online shopping, online banking transactions, or social networking, VPN can provide users with a more secure Internet experience and reduce risks.
- Free Access: Users can bypass geographical restrictions to access streaming services, websites, or applications around the world and enjoy richer Internet content.
- Avoiding Bandwidth Limitations: Some Internet service providers may throttle specific types of traffic. Using a VPN can help users avoid these limitations and enjoy a smoother network experience.
- Improved Work Efficiency: For users who need to work remotely, VPN can securely access the company's internal network, ensuring the security of work information.
What can a VPN change in account workflows?
A VPN changes the network egress and can protect traffic between the device and VPN gateway. It cannot, by itself, prevent account association because platforms can also use cookies, login details, device and browser fingerprints, payment information, and behavior.
Changing the visible network address: A destination generally sees the VPN gateway rather than the user's local address. This addresses one network signal, not device identity.
Encrypting the local-to-gateway path: This can protect data on untrusted networks, but encryption does not isolate cookies, storage, device signals, or user behavior.
Adding one security layer: A VPN can reduce some network interception risks. It does not replace endpoint security, multi-factor authentication, malware protection, or platform-compliant account practices.
Disadvantages of VPN
With the upgrading of network detection, VPN has also shown some disadvantages:
Unstable Connection: Some VPN services may have unstable connections, causing users to frequently disconnect or fail to connect during use, affecting the user experience.
Cost Issue: Although there are some free VPN services, most high-quality VPNs require a subscription fee. Free VPNs usually have limitations on bandwidth and speed, and may even have privacy risks.
Legal and Policy Restrictions: In some countries and regions, using a VPN may be illegal or subject to strict regulations. Users need to understand local laws and regulations before using a VPN to avoid unnecessary trouble.
Trust Issues: Not all VPN providers are trustworthy. Some free VPNs may record users' data or sell users' personal information. Therefore, when choosing a VPN service, users need to carefully study the provider's privacy policy and reputation.
Configuration Complexity: Some VPNs require manual configuration, especially on routers or advanced devices, which may have a certain technical threshold for ordinary users, leading to inconvenience in use.
Incompatibility with Some Services: Some streaming services or websites may detect and block VPN users, preventing users from accessing their favorite content or services.
Device Limitations: Some VPN services have restrictions on the number of simultaneously connected devices. If you need to use a VPN on multiple devices, you may need to pay extra or choose a higher-level package.
