Why upload comes first before download

Before we dive into why upload comes first, let’s quickly define upload and download in data communication.

Upload refers to sending data from your device to a remote server or another device. This happens when you send an email, upload a file to the cloud, or even just request a webpage.

Download is the process of receiving data from a remote source to your device. This includes streaming videos, loading webpages, or saving files from the internet.

Think of it like a conversation: when you ask someone a question (upload), they respond with an answer (download). The same applies to internet communication—before you can receive data, you must first send a request.

Why Upload Comes First in Data Communication

Now that we understand uploads and downloads, let’s put it in simple human terms. Imagine you’re having a conversation with a friend:

1. You ask a question (Upload): Before your friend can give you an answer, you first need to say something—whether it’s a question, a request, or a greeting.
2. Your friend processes your request: They think about your question, recall information, or decide what to say.
3. They respond (Download): Only after understanding your request do they reply with an answer.

Data communication works the exact same way. Your device must first upload a request (just like speaking) before the server can send back the information (just like responding).

This happens constantly when you use the internet:

• Searching Google → You type a search query (upload), and Google sends back results (download).
• Streaming Music → You press play (upload), and the music starts playing (download).
• Video Calls → Every word you say (upload) is sent to the other person before you hear their response (download).

Even though these processes happen in milliseconds, the fundamental rule remains: No upload, no download. Just like in human conversation, if you never ask, you’ll never receive a response.

Credits to sir Mar Flordeliza one of my mentors 😊

References:

- https://edu.gcfglobal.org/en/basic-computer-skills/downloading-and-uploading/1/

- https://www.allconnect.com/blog/difference-between-download-upload-internet-speeds