Explain the transport layer in detail

Transport Layer:Transport layer ensures and controls the end-to-end integrity of data message propagated via the network  amid two devices that provides  for  the  reliable,  transparent  transfer  of  data  between  two  end  points  . Transport layer responsibilities  comprisesmessage  routing,  error recovery,  segmenting and two types of fundamental services to an upper-layer protocol: connectionless and connectionoriented.  Transport  layer  is the  highest  layer  in  OSI hierarchy in terms of communications and may provide data tracking, sequencing  of  data,  connection flow  control, application  addressing  and identification and  error  checking.