What is the difference between these two declarations?

Code:

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[DllImport("user32.dll")]
public static extern int FindWindow(string lpClassName, string lpWindowName);

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Code:

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[DllImport("user32", EntryPoint = "FindWindowA")]
private static extern IntPtr FindWindow(
[MarshalAs(UnmanagedType.LPStr)] string lpClassName,
[MarshalAs(UnmanagedType.LPStr)] string lpWindowName);

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The first one I understand.

The second one im not sure what these items mean
1. EntryPoint =
2. IntPtr
3. MarshalAs(UnmanagedType.LPStr)

can someone explain those three items and how they are different from the first one?

First stop: MSDN.

DllImportAttribute.EntryPoint field
IntPtr structure
MarshalAsAttribute class
UnmanagedType enumeration