In computer security, logging in (or logging on, signing in, or signing on) is the process by which an individual gains access to a computer system by identifying and authenticating themselves. The user credentials are typically some form of username and a matching password,[1] and these credentials themselves are sometimes referred to as a login (or logon, sign-in, sign-on).[2][1] In practice, modern secure systems often require a second factor such as email or SMS confirmation for extra security. Social login allows a user to use existing user credentials from a social networking service to sign in to or create an account on a new website.
Logging out of a computer, when leaving it, is a common security practice preventing unauthorised users from tampering with it. There are also people who choose to have a password-protected screensaver set to activate after some period of inactivity, thereby requiring the user to re-enter his or her login credentials to unlock the screensaver and gain access to the system.
use cod in notpad
<!doctyhtml>
<head>
<title>Login Page</title>
</head>
<body>
<form name="loginForm" method="post" action="login.php">
<table width="20%" bgcolor="7CFC00" align="center">
<tr>
<td colspan=2><center><font size=4><b>HTML Login Page</b></font></center></td>
</tr>
<tr>
<td>Username:</td>
<td><input type="text" size=25 name="userid"></td>
</tr>
<tr>
<td>Password:</td>
<td><input type="Password" size=25 name="pwd"></td>
</tr>
<tr>
<td><input type="submit" onclick="return check(this.form)" value="Login"></td>
</tr>
</table>
</form>
<script language="javascript">
function check(form)
{
if(form.userid.value == "Roseindia" && form.pwd.value == "Roseindia")
{
return true;
}
else
{
alert("Please enter the user id and password")
return false;
}
}
</script>
</body>
</html>
