When I first started coding, people kept saying "API" everywhere. Tutorials → API Projects → API Job descriptions → API And I kept thinking, okay but WHAT EVEN IS IT 😭 Everyone explained it in complicated words, so I just nodded and moved …

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What is an API? Explained the way I wish someone had told me

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Enterprise IT / Cloud Infrastruktur

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When I first started coding, people kept saying "API" everywhere.

Tutorials → API

Projects → API

Job descriptions → API

And I kept thinking, okay but WHAT EVEN IS IT 😭

Everyone explained it in complicated words, so I just nodded and moved on.

If you're confused too : keep reading. This will finally make sense.

Think of a restaurant 🍽️

You sit at the table and order food

You don't walk into the kitchen and cook it yourself

You tell the waiter → waiter goes to the kitchen → brings food back

That waiter is the API.

you - your app

waiter - api

kitchen - another company's system

The API takes your request, goes to get what you need, and brings back the answer. That's the whole job.

Where do you actually see APIs in real life? 👀

☁️ Weather app → asks a weather service for today's weather

🔐 "Login with Google" → website asks Google to confirm who you are

🗺️ Swiggy / Uber maps → uses Google Maps API to show your location

💳 Online payments → Razorpay / Stripe API processes the transaction

Once you know what an API is, you'll start seeing them everywhere.

What does it look like in code? 💻

You open a weather app and search Delhi.

Your app sends a request: GET /weather?city=Delhi

API replies: { "temperature": "34°C", "condition": "Sunny" }

Your app shows: 🌤️ Delhi → 34°C

See what happened?

Your app didn't calculate the weather.

It didn't store any weather data

It just asked someone who already had it

That's exactly what APIs do.

So what is an API? One line:

API = messenger between two applications.

You ask → API gets it → you receive the answer.

That's genuinely it. 🙂

I'm learning in public and writing about everything that confused me as a beginner. Follow if you want more of this 👋

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Syntax validiert (0 Fehler)

title: Detect Exploitation - What is an API? Explained the way I wish someone had told me
id: 9a90b97a-b379-483d-8c0f-697dd7b4d56e
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'exploit'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access

Syntax validiert (0 Fehler)

rule CTI_Threat_Indicator {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-25"
        description = "YARA Signature for "
    strings:
        $str = "What is an API? Explained the " ascii wide
    condition:
        any of them
}

Syntax validiert (0 Fehler)

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("What is an API Explained the way I wish ")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - count

Syntax validiert (0 Fehler)

message: "*What is an API Explained the way I wish *"

Syntax validiert (0 Fehler)

CommonSecurityLog
| where Message has "What is an API Explained the way I wish "
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

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# Exploit Title: PoC for Target
import socket, sys
target = '192[.]168[.]1[.]10'
url = 'hxxp://target[.]local/vuln'
s = socket.socket()
s.connect((target, 80))
s.send(b'GET / HTTP/1.1\r\nHost: target.local\r\n\r\n')

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