Ingress and egress are two sides of the same coin: ingress means “coming in” and egress means “going out,” whether you’re talking about people, data, or network traffic.

What ingress and egress mean (plain English)

  • Ingress = entry, incoming movement into a defined space (a building, a network, a system).
  • Egress = exit, outgoing movement leaving that space.

A simple way to remember it:

Ingress = in
Egress = exit

In buildings and safety

In law, architecture, and safety codes, ingress and egress describe how people get in and out of a place.

  • Ingress: doors, gates, or paths used to enter a property or building.
  • Egress: exits, corridors, stairwells, and emergency routes people use to get out, especially in a fire or evacuation.

For example, fire codes require enough egress routes so people can leave a crowded venue quickly and safely.

In networking and the cloud

In tech and networking, the same idea applies to data instead of people.

  • Ingress traffic: data coming into your network or system from the outside (like responses from websites, incoming API requests, or user traffic hitting your servers).
  • Egress traffic: data leaving your network to the internet or another external network (like your app calling third‑party APIs, sending logs to an external tool, or transferring data to another cloud).

Cloud providers also often charge “egress fees” for data going out of their environment, which is why egress is a big topic in cloud cost and security discussions.

Quick HTML table (ingress vs egress)

html

<table>
  <thead>
    <tr>
      <th>Aspect</th>
      <th>Ingress (In)</th>
      <th>Egress (Out)</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Basic meaning</td>
      <td>Entering or coming into a place or system [web:2][web:4]</td>
      <td>Leaving or exiting a place or system [web:2][web:4]</td>
    </tr>
    <tr>
      <td>Buildings / property</td>
      <td>Entrances, access routes into a site or building [web:2][web:10]</td>
      <td>Exits and escape routes out of a site or building [web:2][web:10]</td>
    </tr>
    <tr>
      <td>Networking / cloud</td>
      <td>Incoming network traffic to your system or network [web:3][web:5]</td>
      <td>Outgoing network traffic from your system to external destinations [web:1][web:3][web:7]</td>
    </tr>
    <tr>
      <td>Security focus</td>
      <td>Protecting what is allowed to come in (e.g., firewalls, WAFs) [web:1][web:5]</td>
      <td>Controlling what can leave, to prevent data exfiltration (egress filtering) [web:1][web:7]</td>
    </tr>
    <tr>
      <td>Cloud costs</td>
      <td>Often not billed separately</td>
      <td>Frequently metered and billed as data transfer “egress” [web:1][web:5]</td>
    </tr>
  </tbody>
</table>

How forums and news talk about it now

Online forum threads and Q&As still explain ingress vs egress in very practical terms, especially for cloud and DevOps work. Common themes:

  • For AWS security groups and similar tools, people say: ingress = “who can connect to you,” egress = “who you can connect to.”
  • For VPNs and Kubernetes, guides emphasize that ingress and egress rules are key to zero‑trust security, data‑leak prevention, and controlling cloud costs.

Tiny story to lock it in

Imagine a secure office building:

  1. The front door where visitors check in is ingress: it controls who may enter.
  1. The emergency exits and stairwells are egress: they ensure everyone can get out quickly and safely.
  1. Now picture your company network as that building: data packets coming from users on the internet are ingress, and data you send out to other services or clouds are egress.

TL;DR

  • Ingress = in (entering a place or system, or incoming traffic).
  • Egress = out (exiting a place or system, or outgoing traffic).

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.