Android Studio질문있습니다..

Question

    InputStream is = null;
    BufferedReader in = null;


    is = conn.getInputStream();
    in = new BufferedReader(new InputStreamReader(is), 8 * 1024);
    String line = null;
    StringBuffer buff = new StringBuffer();
    while ( ( line = in.readLine() ) != null )
    {
        buff.append(line + "\n");
    }
    data = buff.toString().trim();
    Log.e("RECV DATA",data);

} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}
return data;

동작 원리를 설명해주실분 있으신가요?