What is the BufferedReader class?

What is the BufferedReader class? A class for reading text files. There is a readline method that reads a text file line by line. There is also a FileReader class, but it seems to be inefficient because it reads characters one by one.

public class Main {
  public static void main(String[] args) {

    //Check if the file exists by specifying it.
    File file = new File("c:\\Sample\\Test.txt");
    if(!file.exists()){
      System.out.print("File does not exist");
      return;
    }

    //Instead of reading the specified file, the file to be read is specified.
    FileReader fileReader = new FileRreader(file);
    //The specified file is being read.
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    String data;
    //Read line by line with the readLine method until a null value is output.
    while((data = bufferReader.readLine()) != null){
      System.out.println(data)
    }

    fileReader.close();
    
    //Error output.
  } catch(IOException e) {
    e.printStaticTrace();
  }
}

A memo of each class that came out. File class // Specify the file to operate FileReader class // Specify the file to read BufferedReader class // Reading a file.

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