T-code

A transaction code (or t-code) consists of letters, numbers, or both, and is entered in the command field at the top of any SAP GUI screen. Each function in SAP ERP has an SAP transaction code associated with it.
Use
A transaction code is used to access functions or running programs (including executing ABAP code) in the SAP application more rapidly. By entering a t-code instead of using the menu, navigation and execution are combined into a single step, much like shortcuts in the Windows OS.
SAP transaction codes can be entered into the Transaction code field to navigate the user directly to the screen or program task bypassing the SAP menu. This is the preferred method of using SAP because navigating the menus is time-consuming and you need to know where to look in the menus. However, the user must know the transaction code.
The alternative to using and having to know the transaction codes is to set up a favorites menu which is a customized menu established by the user. The favorites menu can be structured by the user to coincide with the procedural usage of the SAP software. For example, if the user is an Accounts Payable officer a customized menu of accounts payable functions could be created to enhance SAP use.
Example
Users can create a new session and start a new transaction in one step by entering /o followed by the transaction code e.g. /oFB60
(source: practicalsap.com)
Example Transaction codes
MM01 creation of Material Master
XK01 Creation of Vendor Master
XD01 creation of Customer Master
FB60 Accounts Payable Invoice Entry
FB65 Accounts Payable Credit Note Entry
FK10N Display Accounts Payable Balances
The transaction for MM module starts with M.

IH09 - Display Material
MM01 - Create Material
MM02 - Change Material
MM03 - Display Material
MM50 - List Extendable Materials
MMBE - Stock Overview
MMI1 - Create Operating Supplies
MMN1 - Create Non-Stock Material
MMS1 - Create Service
MMU1 - Create Non-Valuated Material

ME51N - Create Purchase Requisition
ME52N - Change Purchase Requisition
ME53N - Display Purchase Requisition
ME5A - Purchase Requisitions: List Display
ME5J - Purchase Requisitions for Project
ME5K - Requisitions by Account Assignment
MELB - Purch. Transactions by Tracking No.

ME56 - Assign Source to Purch. Requisition
ME57 - Assign and Process Requisitions
ME58 - Ordering: Assigned Requisitions
ME59 - Automatic Generation of POs

ME54 - Release Purchase Requisition
ME55 - Collective Release of Purchase Reqs.
ME5F - Release Reminder: Purch. Requisition

MB21 - Create Reservation
MB22 - Change Reservation
MB23 - Display Reservation
MB24 - Reservations by Material
MB25 - Reservations by Account Assignment

MB1C - Other Goods Receipts
MB90 - Output Processing for Mat. Documents

MB21 - Create Reservation
MB22 - Change Reservation
MB23 - Display Reservation
MB24 - Reservations by Material
MB25 - Reservations by Account Assignment

MBRL - Return Delivery per Mat. Document

MB1C - Other Goods Receipts
MB90 - Output Processing for Mat. Documents

MB1B - Transfer Posting

MIBC - ABC Analysis for Cycle Counting

MI01 - Create Physical Inventory Document
MI02 - Change Physical Inventory Document
MI03 - Display Physical Inventory Document
MI31 - Batch Input: Create Phys. Inv. Doc.
MI32 - Batch Input: Block Material
MI33 - Batch Input: Freeze Book Inv.Balance
MICN - Btch Inpt:Ph.Inv.Docs.for Cycle Ctng
MIK1 - Batch Input: Ph.Inv.Doc.Vendor Cons.
MIQ1 - Batch Input: PhInvDoc. Project Stock

MI01 - Create Physical Inventory Document
MI02 - Change Physical Inventory Document
MI03 - Display Physical Inventory Document
MI31 - Batch Input: Create Phys. Inv. Doc.
MI32 - Batch Input: Block Material
MI33 - Batch Input: Freeze Book Inv.Balance
MICN - Btch Inpt:Ph.Inv.Docs.for Cycle Ctng
MIK1 - Batch Input: Ph.Inv.Doc.Vendor Cons.
MIQ1 - Batch Input: PhInvDoc. Project Stock

MI01 - Create Physical Inventory Document
MI02 - Change Physical Inventory Document
MI03 - Display Physical Inventory Document
MI31 - Batch Input: Create Phys. Inv. Doc.
MI32 - Batch Input: Block Material
MI33 - Batch Input: Freeze Book Inv.Balance
MICN - Btch Inpt:Ph.Inv.Docs.for Cycle Ctng
MIK1 - Batch Input: Ph.Inv.Doc.Vendor Cons.
MIQ1 - Batch Input: PhInvDoc. Project Stock

MI21 - Print physical inventory document

MI04 - Enter Inventory Count with Document
MI05 - Change Inventory Count
MI06 - Display Inventory Count
MI09 - Enter Inventory Count w/o Document
MI34 - Batch Input: Enter Count
MI35 - Batch Input: Post Zero Stock Balance
MI38 - Batch Input: Count and Differences
MI39 - Batch Input: Document and Count
MI40 - Batch Input: Doc., Count and Diff.

MI08 - Create List of Differences with Doc.
MI10 - Create List of Differences w/o Doc.
MI20 - Print List of Differences

MI11 - Physical Inventory Document Recount

MI07 - Process List of Differences
MI37 - Batch Input: Post Differences

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