FTP (File Transfer Protocol) is a network protocol used to transfer the files between the client and server machines. It uses TCP port 20 & 21 for connection  and  data transmission between the two machine I.e client and server.

Step 1. Update packages.

# apt-get update

Step 2. Install ftp server on linux machine

# apt-get install vsftpd ftp -y

Step 3. Open /etc/vsftpd.conf file & change following settings.
Note: Uncomment Write_enable=YES

Note: Add these 4 lines at the end of the file after that save & exit

Step 4. Create a Ftpuser & you can specify any Name & Password for your user.

# adduser ftpuser

Step 5. Assign permission to ftpuser.

# chmod 777 /home/ftpuser

Step 4. Restart ftp server.

# service vsftpd restart

Windows Machine

Step 1. Download Ftp Client Named Filezilla From Below Link.

https://filezilla-project.org/download.php?show_all=1

Step 2. Open Filezilla and mention your Host Username and Password for connectivity.

Note : Now you can easily transfer your data from linux machine to windows machine or vice versa through drag and drop data.