Blocking

Blocking is the act of preventing a specific target or flow from passing, and is a concept used in various fields ranging from physical blocking to internet, communication, and psychological blocking.

Blocking

Overview

Blocking (Korean: 차단; Chinese characters: 遮蔽, 遮斷; English: Blocking) literally means 'to obstruct and prevent passage,' and is utilized in diverse areas such as physical space, electromagnetic signals, network traffic, human relationships, and psychological processes. In modern society, 'blocking' has become a key tool for information access control, cybersecurity, and content moderation, particularly in combination with internet technology. This document introduces the multilayered meanings of blocking, practical applications, and the latest trends of the mid-2020s.

Main Content

1. Physical Blocking

The oldest form of blocking is preventing threats or harmful elements in physical space. In architecture, firewalls, soundproof walls, and partitions block the spread of fire, noise transmission, and invasion of privacy. Nuclear power plants use lead and concrete for radiation shielding, and in the military field, physical blocking technologies such as ballistic missile defense systems have been developed to intercept enemy attacks. In addition, electromagnetic interference (EMI) shielding is an essential engineering technology that ensures sensitive electronic systems such as aircraft and medical devices are not affected by external interference.

2. Internet and Communication Blocking

In the digital age, 'blocking' is mainly carried out at the network level.

  • IP Blocking: This is the most basic security measure that blocks access from specific IP addresses to prevent malicious bots or unauthorized access. Server administrators can block traffic from specific countries or address ranges through firewall rules.
  • URL Filtering: A technology that prevents users from accessing specific sites through web proxies or DNS filtering. It is commonly used by companies and schools to block productivity-reducing sites, and is also a tool for state-level censorship of politically and socially sensitive content.
  • Application Blocking: Mobile device management (MDM) solutions that restrict the use of specific apps such as SNS and games are also widely used.
  • Receive Blocking: Functions such as spam filters in email, number blocking in phones, and hiding posts from specific accounts on SNS are provided.

These blocking technologies are essential elements of cybersecurity, but at the same time, they can infringe on freedom of expression and the right to access information, sparking controversy. For example, internet censorship in certain countries is pointed out as a human rights issue by the international community.

3. Social Blocking

'Blocking' is also used in human relationships. If a person blocks another person on SNS or messenger, they can no longer see each other's posts or contact each other, which is regarded as a way to resolve interpersonal conflicts and maintain psychological safety. Conversely, cutting off contact can be seen as a form of social exclusion that severs relationships with a specific individual or group. In particular, victims of school violence or workplace bullying use it as a means to block contact with perpetrators.

4. Psychological Blocking

In psychology, 'blocking' is conceptualized as one of the defense mechanisms. For example, it refers to the phenomenon in which an individual prevents painful memories or emotions from entering consciousness. This is similar to 'repression,' but in clinical settings, 'blocking' is used more broadly to refer to avoiding a specific topic during the thought process. Such psychological blocking becomes an important therapeutic intervention point in conditions such as post-traumatic stress disorder (PTSD).

5. Medical Blocking

In medicine, there are treatments that block the transmission of nerve signals. For example, a 'nerve block' is a method of alleviating chronic pain by injecting local anesthetics or nerve-destroying drugs. In addition, autonomic nerve blocking is used to suppress blood pressure elevation or control excessive sweating. Recently, in AI-based drug development, molecular designs that block the binding of specific proteins are also being actively researched.

Latest Trends

Trends related to blocking from 2024 to 2025 can be summarized along three main axes.

  • Advancement of AI-Based Blocking Technologies: Intelligent security systems that identify and block malicious traffic in real time using machine learning algorithms are spreading. In particular, as the production of malicious content using generative AI (GenAI) increases, AI-based content detection and blocking technologies to counter it are being developed competitively.
  • Politicization of Regulation and Blocking: With the enforcement of the European Union's Digital Services Act (DSA), obligations to block illegal content have been strengthened. At the same time, countries such as Russia and China are further strengthening internal information control, and as a countermeasure, demand for virtual private network (VPN) usage and 'blocking bypass' technologies is increasing.
  • Everydayization of User-Driven Blocking: As online violence and hate speech increased after the COVID-19 pandemic, platforms are further refining features that allow individual users to block specific users. For example, Instagram introduced a 'hidden words' filter, and X (formerly Twitter) is conducting experiments in which user communities decide whether to block content through the Community Notes feature.

Related Topics

  • [[Internet censorship]]
  • [[Firewall]]
  • [[Cybersecurity]]
  • [[SNS blocking features]]
  • [[Freedom of expression]]
  • [[Defense mechanism]]