Streams

In React Js, the term "Streams" isn't directly related or doesn't have a distinct definition. However, in the larger context of JavaScript or Node.js, Streams are a way to handle reading/writing files, network communications, or any kind of end-to-end information exchange in an efficient manner.

In simple English, a stream means a sequence of data elements made available over time. These are especially useful when working with large amounts of data, or real-time information, as they allow applications to start processing data as soon as it becomes available, without waiting for all data to fully load.

However, ReactJS is usually used for building user interfaces and it doesn't necessarily interact with streams directly. But, if you are using Node.js in your backend and want to send data from Node.js to a ReactJs app then it might be possible to use streams for efficient data transfer.

Here's an example of how you might use streams in Node.js, not React:

```javascript
const fs = require('fs');
const readStream = fs.createReadStream('./example.txt', 'utf8');
const writeStream = fs.createWriteStream('example2.txt');
readStream.on('data', (chunk) => {
writeStream.write(chunk);
});
```

In this code snippet, we're creating a read stream on the file 'example.txt', and a write stream to 'example2.txt'. As data becomes available on the read stream (i.e. as chunks of the file are loaded), we write those data chunks to the write stream (i.e. to the file 'example2.txt'). This way of handling files is more efficient than waiting for the entire file to load.