  We present the first far-UV (FUV) imaging results of the intermediate-age
Galactic open cluster NGC 2818 that has a Planetary nebula (PN) within the
field using images taken from the Ultra-violet Imaging Telescope (UVIT) aboard
AstroSat. We identify cluster members by combining UVIT-detected sources with
Gaia EDR3 data. We detect four bright and hot blue straggler stars (BSSs) and
two yellow straggler stars (YSSs) based on their location in the optical and
FUV-optical color-magnitude diagrams. Based on the parameters estimated using
Spectral Energy Distribution (SED), we infer that BSSs are either collisional
products or might have undetectable white dwarf (WD) companions. Our
photometric analysis of YSSs confirms their binarity, consistent with the
spectroscopic results. We find YSSs to be formed through a mass-transfer
scenario and the hot components are likely to be A-type subdwarfs. A comparison
of the radial velocity (RV), Gaia EDR3 proper motion of the PN with the
cluster, and reddening towards the PN and the cluster does not rule out the
membership of the PN. Comparing the central star's position with theoretical
pAGB models suggest that it has already entered the WD cooling phase, and its
mass is deduced to be ~0.66Msun. The corresponding progenitor mass turns out to
be ~2.1Msun, comparable to the turn-off mass of the cluster, implying that the
progenitor could have formed in the cluster. We suggest that the NGC 2818 might
be one of the few known clusters to host a PN, providing a unique opportunity
to test stellar evolution models.
