Making it simple, localhost as a web address connects to your local machine, where in this case you have Apache installed as web server. The second part, :8080, means connect to port 8080 of that web address. If you don't specify it, your web browser will connect to the default webserver port, which is port 80.
Employer Identification Number. The Employer Identification Number (EIN), also known as the Federal Employer Identification Number (FEIN) or the Federal Tax Identification Number, is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to business entities operating in the United States for the purposes of identification.
A Taxpayer Identification Number (TIN) is an identification number used by the Internal Revenue Service (IRS) in the administration of tax laws. It is issued either by the Social Security Administration (SSA) or by the IRS.A Social Security number (SSN) is issued by the SSA whereas all other TINs are issued by the IRS.n ITIN, or Individual Taxpayer Identification Number, is a tax processing number only available for certain nonresident and resident aliens, their spouses, and dependents who cannot get a Social Security Number (SSN). It is a 9-digit number, beginning with the number 9, formatted like an SSN (NNN-NN-NNNN).